diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4ff9b7edf9bc36823916ec121ea2834da902790f..a1b3367ba3f68ef01f0f26ee514ac6700308241f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [Unreleased](https://github.com/usgs/waterdataui/compare/waterdataui-1.2.0...master)
 ### Added
 - Daily statistical data will now appear under the parameter selection list.
+- Data tables accordion shows a table for a secondary instantaneous value parameter data when a second parameter (that has data) is selected.
 
 ### Changed
 - Data download component was converted to Vue.
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/index.test.js b/assets/src/scripts/monitoring-location/components/hydrograph/index.test.js
index 9d3f23c635dfbb7df616e977c5f74a94f8b6d3ef..27000191180dae06b53a821961bc87fc4ce0d01e 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/index.test.js
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/index.test.js
@@ -364,7 +364,8 @@ describe('monitoring-location/components/hydrograph module', () => {
         });
 
         it('should have data tables for hydrograph data', () => {
-            expect(select('#iv-table-container').size()).toBe(1);
+            expect(select('#iv-primary-table-container').size()).toBe(1);
+            expect(select('#iv-secondary-table-container').size()).toBe(1);
             expect(select('#gw-table-container').size()).toBe(1);
         });
 
@@ -477,7 +478,8 @@ describe('monitoring-location/components/hydrograph module', () => {
         });
 
         it('should not have data tables for hydrograph data', () => {
-            expect(select('#iv-table-container').size()).toBe(0);
+            expect(select('#iv-primary-table-container').size()).toBe(0);
+            expect(select('#iv-secondary-table-container').size()).toBe(0);
             expect(select('#gw-table-container').size()).toBe(0);
         });
 
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/mock-hydrograph-state.js b/assets/src/scripts/monitoring-location/components/hydrograph/mock-hydrograph-state.js
index 111cfe58f8385eb3c4f2ecc39dea8abb449d4049..cdb613fc691d8e1351e54da33a97e0977644ec0d 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/mock-hydrograph-state.js
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/mock-hydrograph-state.js
@@ -43,6 +43,34 @@ export const TEST_PRIMARY_IV_DATA = {
     }
 };
 
+export const TEST_SECONDARY_IV_DATA = {
+    parameter: {
+        parameterCode: '00065',
+        name: 'Gage height, ft',
+        description: 'Gage height, feet',
+        unit: 'ft'
+    },
+    values: {
+        '57465': {
+            points: [
+                {value: '3', qualifiers: ['A'], dateTime: 1582560900000},
+                {value: '3.2', qualifiers: ['A'], dateTime: 1582561800000},
+                {value: null, qualifiers: ['A', 'ICE'], dateTime: 1582562700000},
+                {value: null, qualifiers: ['A', 'ICE'], dateTime: 1582569900000},
+                {value: '4', qualifiers: ['E'], dateTime: 1582570800000},
+                {value: '5.8', qualifiers: ['E'], dateTime: 1600617600000},
+                {value: '7', qualifiers: ['E'], dateTime: 1600618500000},
+                {value: '6.5', qualifiers: ['P'], dateTime: 1600619400000},
+                {value: '5.9', qualifiers: ['P'], dateTime: 1600620300000}
+            ],
+            method: {
+                methodID: '57465',
+                methodDescription: ''
+            }
+        }
+    }
+};
+
 export const TEST_STATS_DATA = {
         '153885': [
             {month_nu: 2, day_nu: 24, p50_va: 16, ts_id: '153885', loc_web_ds: 'Method1', begin_yr: '2011', end_yr: '2020', max_va_yr: '2020',
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/selectors/iv-data.js b/assets/src/scripts/monitoring-location/components/hydrograph/selectors/iv-data.js
index c1c481d5c9bc93e8003ce5cf09186921307fe741..32e2d4417d1acde4543eaf9b208c1287ca9af106 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/selectors/iv-data.js
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/selectors/iv-data.js
@@ -7,7 +7,7 @@ import {createSelector} from 'reselect';
 
 import config from 'ui/config';
 
-import {getIVData, getIVPrimaryParameter} from 'ml/selectors/hydrograph-data-selector';
+import {getIVData, getIVParameter} from 'ml/selectors/hydrograph-data-selector';
 import {getSelectedIVMethodID} from 'ml/selectors/hydrograph-state-selector';
 
 const MASKED_QUALIFIERS = {
@@ -181,7 +181,7 @@ export const getIVDataRange = memoize(dataKind => createSelector(
  */
 export const getIVTableData = memoize(dataKind => createSelector(
     getIVDataPoints(dataKind),
-    getIVPrimaryParameter,
+    getIVParameter(dataKind),
     (ivData, parameter) => {
         if (!ivData) {
             return [];
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/selectors/time-series-data.js b/assets/src/scripts/monitoring-location/components/hydrograph/selectors/time-series-data.js
index b28857c30f7029357fa4505c6f90ec4584d099a2..760d8bd835b0beafbc7251a04001f2bbc0dc8dcd 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/selectors/time-series-data.js
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/selectors/time-series-data.js
@@ -5,10 +5,11 @@ import {createSelector} from 'reselect';
 import config from 'ui/config';
 
 import {getSelectedGroundwaterLevels} from 'ml/selectors/groundwater-level-field-visits-selector';
-import {getIVData, getStatisticsData, getPrimaryMethods, getIVPrimaryParameter,
+import {getIVData, getStatisticsData, getPrimaryMethods, getIVParameter,
     getTimeRange
 } from 'ml/selectors/hydrograph-data-selector';
 import {getSelectedIVMethodID, isCompareIVDataVisible, isMedianDataVisible} from 'ml/selectors/hydrograph-state-selector';
+import {isSecondaryIVDataVisible} from '../../../selectors/hydrograph-state-selector';
 
 const formatTime = function(timeInMillis) {
     return DateTime.fromMillis(timeInMillis, {zone: config.locationTimeZone}).toFormat('L/d/yyyy tt ZZZ');
@@ -19,7 +20,7 @@ const formatTime = function(timeInMillis) {
  * parameter that is currently displayed in the hydrograph or null if no data.
  */
 export const getPrimaryParameter = createSelector(
-    getIVPrimaryParameter,
+    getIVParameter('primary'),
     getSelectedGroundwaterLevels,
     (ivParameter, gwLevels) => {
         return ivParameter ? ivParameter : gwLevels ? gwLevels.parameter : null;
@@ -28,16 +29,19 @@ export const getPrimaryParameter = createSelector(
 
 /**
  * Returns a Redux selector function which returns whether the dataKind time series is visible
- * @param  {String} dataKind - 'primary', 'compare', 'median'
+ * @param  {String} dataKind - 'primary', 'secondary', 'compare', or 'median'
  * @return {Function}
  */
 export const isVisible = memoize(dataKind => createSelector(
+    isSecondaryIVDataVisible,
     isCompareIVDataVisible,
     isMedianDataVisible,
-    (compareVisible, medianVisible) => {
+    (secondaryVisible, compareVisible, medianVisible) => {
         switch (dataKind) {
             case 'primary':
                 return true;
+            case 'secondary':
+                return secondaryVisible;
             case 'compare':
                 return compareVisible;
             case 'median':
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/selectors/time-series-data.test.js b/assets/src/scripts/monitoring-location/components/hydrograph/selectors/time-series-data.test.js
index 29bf496357224b13d2b46d13a68884d17394268a..787667bf4b56b016c83f1460a30c8dddf4e3ee01 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/selectors/time-series-data.test.js
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/selectors/time-series-data.test.js
@@ -64,6 +64,7 @@ const TEST_STATE = {
     hydrographState: {
         selectedParameterCode: '72019',
         showCompareIVData: false,
+        showSecondaryIVData: false,
         showMedianData: false,
         selectedIVMethodID: '252055'
     }
@@ -75,6 +76,7 @@ describe('monitoring-location/components/hydrograph/selectors/time-series-data m
         it('Returns whether the time series is visible', () => {
             expect(isVisible('primary')(TEST_STATE)).toBe(true);
             expect(isVisible('compare')(TEST_STATE)).toBe(false);
+            expect(isVisible('secondary')(TEST_STATE)).toBe(false);
             expect(isVisible('compare')({
                 ...TEST_STATE,
                 hydrographState: {
@@ -90,6 +92,13 @@ describe('monitoring-location/components/hydrograph/selectors/time-series-data m
                     showMedianData: true
                 }
             })).toBe(true);
+            expect(isVisible('secondary')({
+                ...TEST_STATE,
+                hydrographState: {
+                    ...TEST_STATE.hydrographState,
+                    showSecondaryIVData: true
+                }
+            })).toBe(true);
         });
     });
 
@@ -265,6 +274,7 @@ describe('monitoring-location/components/hydrograph/selectors/time-series-data m
                     all: []
                 },
                 hydrographState: {
+                    showSecondaryIVData: false,
                     showCompareIVData: false,
                     showMedianData: true
                 }
@@ -294,6 +304,7 @@ describe('monitoring-location/components/hydrograph/selectors/time-series-data m
                     all: []
                 },
                 hydrographState: {
+                    showSecondaryIVData: false,
                     showCompareIVData: false,
                     showMedianData: true,
                     selectedIVMethodID: '90649'
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/data-table.test.js b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/data-table.test.js
index 9a18e0ad2aff9411631b9e10af47a6460b7428a9..e092e4d5bde75d3be08b13c1962de9ec1bfcea19 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/data-table.test.js
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/data-table.test.js
@@ -7,7 +7,7 @@ import config from 'ui/config';
 
 import {configureStore} from 'ml/store';
 
-import {TEST_PRIMARY_IV_DATA, TEST_GW_LEVELS} from '../mock-hydrograph-state';
+import {TEST_PRIMARY_IV_DATA, TEST_GW_LEVELS, TEST_SECONDARY_IV_DATA} from '../mock-hydrograph-state';
 
 import DataTable from './data-table.vue';
 import DownloadData from './download-data.vue';
@@ -51,7 +51,8 @@ describe('monitoring-location/components/hydrograph/components/data-table.vue',
             }
         });
 
-        expect(wrapper.find('#iv-table-container').isVisible()).toBe(true);
+        expect(wrapper.find('#iv-primary-table-container').isVisible()).toBe(true);
+        expect(wrapper.find('#iv-secondary-table-container').isVisible()).toBe(false);
         expect(wrapper.find('#gw-table-container').isVisible()).toBe(true);
     });
 
@@ -88,7 +89,8 @@ describe('monitoring-location/components/hydrograph/components/data-table.vue',
             }
         });
 
-        expect(wrapper.find('#iv-table-container').isVisible()).toBe(true);
+        expect(wrapper.find('#iv-primary-table-container').isVisible()).toBe(true);
+        expect(wrapper.find('#iv-secondary-table-container').isVisible()).toBe(false);
         expect(wrapper.find('#gw-table-container').isVisible()).toBe(false);
     });
 
@@ -124,7 +126,48 @@ describe('monitoring-location/components/hydrograph/components/data-table.vue',
             }
         });
 
-        expect(wrapper.find('#iv-table-container').isVisible()).toBe(false);
+        expect(wrapper.find('#iv-primary-table-container').isVisible()).toBe(false);
+        expect(wrapper.find('#iv-secondary-table-container').isVisible()).toBe(false);
+        expect(wrapper.find('#gw-table-container').isVisible()).toBe(true);
+    });
+
+    it('Shows both IV primary and secondary parameter selection tables and GW data table', () => {
+        store = configureStore({
+            hydrographData: {
+                currentTimeRange: {
+                    start: 1582560000000,
+                    end: 1600620000000
+                },
+                primaryIVData: TEST_PRIMARY_IV_DATA,
+                secondaryIVData: TEST_SECONDARY_IV_DATA
+            },
+            groundwaterLevelData: {
+                all: [TEST_GW_LEVELS]
+            },
+            hydrographState: {
+                showSecondaryIVData: true,
+                selectedParameterCode: '72019',
+                selectedIVMethodID: '90649'
+            }
+        });
+
+        wrapper = mount(DataTable, {
+            global: {
+                plugins: [
+                    [ReduxConnectVue, {
+                        store,
+                        mapDispatchToPropsFactory: (actionCreators) => (dispatch) => bindActionCreators(actionCreators, dispatch),
+                        mapStateToPropsFactory: createStructuredSelector
+                    }]
+                ],
+                provide: {
+                    store: store
+                }
+            }
+        });
+
+        expect(wrapper.find('#iv-primary-table-container').isVisible()).toBe(true);
+        expect(wrapper.find('#iv-secondary-table-container').isVisible()).toBe(true);
         expect(wrapper.find('#gw-table-container').isVisible()).toBe(true);
     });
 
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/data-table.vue b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/data-table.vue
index fa0b8057f7806ec21569dedc569ef47d88641394..029cb8c200470de6dc1cd2f70ce214edd47b069f 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/data-table.vue
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/data-table.vue
@@ -1,15 +1,27 @@
 <template>
   <div id="iv-hydrograph-data-table-container">
     <div
-      v-show="currentIVData.IVData.length"
-      id="iv-table-container"
+      v-show="currentPrimaryIVData.IVData.length"
+      id="iv-primary-table-container"
     >
       <PaginatedTable
-        :data-set="currentIVData.IVData"
+        :data-set="currentPrimaryIVData.IVData"
         :headers="ivColumnHeadings"
         :key-order="ivValueNames"
         :sort-by="['dateTime']"
-        :title="`${currentIVData.name} -- instantaneous value data`"
+        :title="`${currentPrimaryIVData.name} -- instantaneous value data`"
+      />
+    </div>
+    <div
+      v-show="currentSecondaryIVData.IVData.length && isSecondaryParameterSelected"
+      id="iv-secondary-table-container"
+    >
+      <PaginatedTable
+        :data-set="currentSecondaryIVData.IVData"
+        :headers="ivColumnHeadings"
+        :key-order="ivValueNames"
+        :sort-by="['dateTime']"
+        :title="`${currentSecondaryIVData.name} -- instantaneous value data`"
       />
     </div>
     <div
@@ -66,6 +78,7 @@ import config from 'ui/config.js';
 
 import {getIVTableData} from '../selectors/iv-data';
 import {getGroundwaterLevelsTableData} from '../selectors/discrete-data';
+import {isVisible} from '../selectors/time-series-data';
 
 import DownloadData from './download-data.vue';
 import PaginatedTable from './paginated-table.vue';
@@ -77,8 +90,6 @@ export default {
     PaginatedTable
   },
   setup() {
-    const downloadIcon = `${config.STATIC_URL}img/sprite.svg#file_download`;
-    const showDownloadContainer = ref(false);
     const COLUMN_HEADINGS = {
       iv: ['Time', 'Result', 'Approval', 'Masks'],
       gw: ['Time', 'Result', 'Accuracy', 'Approval', 'Qualifiers']
@@ -99,17 +110,20 @@ export default {
       return result;
     };
 
-    const getIVData = createSelector(
-      getIVTableData('primary'),
-      (data) => {
+    const getIVData = dataKind => createSelector(
+        getIVTableData(dataKind),
+        (data) => {
 
-        return {
-          IVData: data.map(object => filter(object, VALUE_NAMES.iv)),
-          name: data.length ? data[0].parameterName : ''
+          return {
+            IVData: data.map(object => filter(object, VALUE_NAMES.iv)),
+            name: data.length ? data[0].parameterName : ''
           };
-      }
+        }
     );
 
+    const getPrimaryIVData = getIVData('primary');
+    const getSecondaryIVData = getIVData('secondary');
+
     const getGWData = createSelector(
       getGroundwaterLevelsTableData,
       (data) => {
@@ -122,10 +136,15 @@ export default {
     );
 
     const state = useState({
-      currentIVData: getIVData,
+      isSecondaryParameterSelected: isVisible('secondary'),
+      currentPrimaryIVData: getPrimaryIVData,
+      currentSecondaryIVData: getSecondaryIVData,
       currentGWData: getGWData
     });
 
+    const downloadIcon = `${config.STATIC_URL}img/sprite.svg#file_download`;
+    const showDownloadContainer = ref(false);
+
     const toggleDownloadContainer = function() {
       showDownloadContainer.value = !showDownloadContainer.value;
     };
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/parameter-selection.test.js b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/parameter-selection.test.js
index 12565ea8c022f94619a618586ee07e4f77b83adf..f793f04bc9a1efca023e314ccfd36c88e012d46a 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/parameter-selection.test.js
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/parameter-selection.test.js
@@ -57,6 +57,7 @@ describe('monitoring-location/components/hydrograph/vue-components/parameter-sel
         },
         hydrographParameters: TEST_HYDROGRAPH_PARAMETERS,
         hydrographState: {
+            showSecondaryIVData: true,
             selectedTimeSpan: 'P7D',
             selectedParameterCode: '72019',
             selectedIVMethodID: '90649'
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/parameter-selection.vue b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/parameter-selection.vue
index 265a6ce829ea443d0492efc16000d12d31183e93..89c3e7ac6b23c61801459dca5d45763b0630005d 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/parameter-selection.vue
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/parameter-selection.vue
@@ -91,11 +91,12 @@ import config from 'ui/config';
 
 import {getInputsForRetrieval, getSelectedParameterCode} from 'ml/selectors/hydrograph-state-selector';
 
-import {setSelectedParameterCode, setSelectedIVMethodID} from 'ml/store/hydrograph-state';
+import {setSecondaryIVDataVisibility, setSelectedParameterCode, setSelectedIVMethodID} from 'ml/store/hydrograph-state';
 import {retrieveHydrographData} from 'ml/store/hydrograph-data';
 
 import {getAvailableParameters} from '../selectors/parameter-data';
 import {getSortedIVMethods} from '../selectors/time-series-data';
+import {isVisible} from '../selectors/time-series-data';
 
 import {showDataIndicators} from '../data-indicator';
 
@@ -135,13 +136,15 @@ export default {
     const state = useState({
       parameters: getAvailableParameterData,
       sortedIvMethods: getSortedIVMethods,
-      selectedParameterCode: getSelectedParameterCode
+      selectedParameterCode: getSelectedParameterCode,
+      isSecondaryParameterSelected: isVisible('secondary')
     });
 
     const actions = useActions({
       setSelectedParameterCode,
       setSelectedIVMethodID,
-      retrieveHydrographData
+      retrieveHydrographData,
+      setSecondaryIVDataVisibility
     });
 
     // Second parameter selection code
@@ -165,7 +168,7 @@ export default {
           const buttonDetail = {
             id: `second-parameter-radio-button-${parameter.parameterCode}`,
             label: parameter.description,
-            checked: parameterCodeOfSecondaryRadioButton === parameter.parameterCode,
+            checked: state.isSecondaryParameterSelected.value && parameterCodeOfSecondaryRadioButton === parameter.parameterCode,
             actionValue: {
               secondaryParameterCode: parameter.parameterCode
             }
@@ -193,8 +196,7 @@ export default {
     function selectParameter(parameterCode) {
       if (parameterCodeOfSecondaryRadioButton === expandedParameterCode.value) {
         isShowSecondParameterOptionsChecked.value = false;
-        // TODO: Hide second parameter visibility -- perhaps as part of WDFN-732
-        console.log(`Primary button clicked, ${parameterCode}, is same as secondary selection. Remove second parameter from graph`);
+        actions.setSecondaryIVDataVisibility(false);
       }
 
       actions.setSelectedParameterCode(parameterCode);
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/secondary-parameter-controls.test.js b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/secondary-parameter-controls.test.js
index 3ceb186a8e1fb7c1a91b0c571b8e7f5848afeecb..787675f09788730463659b6e20c6972724a6d453 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/secondary-parameter-controls.test.js
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/secondary-parameter-controls.test.js
@@ -1,16 +1,17 @@
-import {shallowMount} from '@vue/test-utils';
-
-import USWDSCheckbox from 'ui/uswds-components/checkbox.vue';
-import USWDSRadioButtonSet from 'ui/uswds-components/radio-button-set.vue';
-
-import SecondaryParameterControls from './secondary-parameter-controls.vue';
+import {enableFetchMocks, disableFetchMocks} from 'jest-fetch-mock';
 import ReduxConnectVue from 'redux-connect-vue';
+import {configureStore} from 'ml/store';
 import {bindActionCreators} from 'redux';
 import {createStructuredSelector} from 'reselect';
-import {TEST_HYDROGRAPH_PARAMETERS, TEST_PRIMARY_IV_DATA} from '../mock-hydrograph-state';
-import {configureStore} from 'ml/store';
+import {shallowMount} from '@vue/test-utils';
 
+import * as utils from 'ui/utils';
 
+import {TEST_HYDROGRAPH_PARAMETERS, TEST_PRIMARY_IV_DATA} from '../mock-hydrograph-state';
+import SecondaryParameterControls from './secondary-parameter-controls.vue';
+
+import USWDSCheckbox from 'ui/uswds-components/checkbox.vue';
+import USWDSRadioButtonSet from 'ui/uswds-components/radio-button-set.vue';
 
 describe('monitoring-location/components/hydrograph/vue-components/secondary-parameter-controls', () => {
     const parameterList =  [
@@ -32,15 +33,28 @@ describe('monitoring-location/components/hydrograph/vue-components/secondary-par
         }
     ];
 
+    beforeAll(() => {
+        enableFetchMocks();
+    });
+
+    afterAll(() => {
+        disableFetchMocks();
+    });
+
     let wrapper;
     let store;
 
     const TEST_STATE = {
         hydrographData: {
-            primaryIVData: TEST_PRIMARY_IV_DATA
+            primaryIVData: TEST_PRIMARY_IV_DATA,
+            currentTimeRange: {
+                start: 1613413736967,
+                end: 1614018536967
+            }
         },
         hydrographParameters: TEST_HYDROGRAPH_PARAMETERS,
         hydrographState: {
+            showSecondaryIVData: true,
             selectedTimeSpan: 'P7D',
             selectedParameterCode: '72019',
             selectedIVMethodID: '90649'
@@ -60,7 +74,8 @@ describe('monitoring-location/components/hydrograph/vue-components/secondary-par
                         }]
                     ],
                     provide: {
-                        store: store
+                        store: store,
+                        siteno: '07144100'
                     }
                 },
                 props: {
@@ -97,6 +112,8 @@ describe('monitoring-location/components/hydrograph/vue-components/secondary-par
         });
 
         it('expects clicking a radio button will emit the correct event', async() => {
+            utils.mediaQuery = jest.fn().mockReturnValue(true);
+            fetch.mockResponse(JSON.stringify({}));
             const radioButtonSetComponent = wrapper.findComponent(USWDSRadioButtonSet);
 
             await radioButtonSetComponent.vm.$emit('updateValue', {
@@ -121,7 +138,8 @@ describe('monitoring-location/components/hydrograph/vue-components/secondary-par
                         }]
                     ],
                     provide: {
-                        store: store
+                        store: store,
+                        siteno: '07144100'
                     }
                 },
                 props: {
diff --git a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/secondary-parameter-controls.vue b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/secondary-parameter-controls.vue
index a45a637fa644c1e4a763512c8c341da9a947e909..8d303ecb7f14913dfb4d4f0c9510dfc7c46d6556 100644
--- a/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/secondary-parameter-controls.vue
+++ b/assets/src/scripts/monitoring-location/components/hydrograph/vue-components/secondary-parameter-controls.vue
@@ -20,15 +20,17 @@
 </template>
 
 <script>
-import {ref} from 'vue';
+import {ref, inject} from 'vue';
 
 import {useActions} from 'redux-connect-vue';
-import {setCompareDataVisibility, setMedianDataVisibility} from 'ml/store/hydrograph-state';
+import {setSecondaryIVDataVisibility, setCompareDataVisibility, setMedianDataVisibility} from 'ml/store/hydrograph-state';
+import {retrieveSecondParameterIVData} from 'ml/store/hydrograph-data';
+import {getTimeRange} from 'ml/selectors/hydrograph-data-selector';
+import {showDataIndicators} from '../data-indicator';
 
 import USWDSCheckbox from 'ui/uswds-components/checkbox.vue';
 import USWDSRadioButtonSet from 'ui/uswds-components/radio-button-set.vue';
 
-
 export default {
   name: 'SecondaryParameterControls',
   components: {
@@ -46,9 +48,14 @@ export default {
     }
   },
   setup(props, {emit}) {
+    const reduxStore = inject('store');
+    const siteNumber = inject('siteno');
+
     const actions = useActions({
+      setSecondaryIVDataVisibility,
       setCompareDataVisibility,
-      setMedianDataVisibility
+      setMedianDataVisibility,
+      retrieveSecondParameterIVData
     });
 
     const showSecondParameterList = ref(false);
@@ -58,14 +65,12 @@ export default {
       const isBoxChecked =  !props.isShowSecondParameterOptionsChecked;
 
       if (!isBoxChecked) {
+        actions.setSecondaryIVDataVisibility(false);
         emit('disableEnableMedianAndCompare', false);
         emit('checkedRadioButton', {
           secondaryParameterCode: ''
         });
-        // TODO: Hide second parameter visibility -- perhaps as part of WDFN-732
-        console.log('check box unchecked: clear any second parameter data from graph ');
       }
-
       emit('checkedCheckBox', isBoxChecked);
     };
 
@@ -76,12 +81,24 @@ export default {
     };
 
     const graphSecondParameter = function(buttonData) {
+      actions.setSecondaryIVDataVisibility(true);
       disableCompareAndMedianButtons();
       emit('checkedRadioButton', buttonData);
-      // TODO: Add data to state -- part of WDFN-735
-      // TODO: Graph data on hydrograph -- part of WDFN-735
-      console.log(`Radio button, ${buttonData.secondaryParameterCode} clicked: fetch data and then run graphing code using secondary parameter ${buttonData.secondaryParameterCode}`);
-     };
+
+      const reduxState = reduxStore.getState();
+      const currentTimeRange = getTimeRange('current')(reduxState);
+      showDataIndicators(true, reduxStore);
+      actions.retrieveSecondParameterIVData(
+         siteNumber,
+         {
+           parameterCode: buttonData.secondaryParameterCode,
+           startTime: currentTimeRange.start,
+           endTime: currentTimeRange.end
+         }
+      ).then(() => {
+        showDataIndicators(false, reduxStore);
+      });
+    };
 
     return {
       showSecondParameterList,
diff --git a/assets/src/scripts/monitoring-location/selectors/flood-data-selector.js b/assets/src/scripts/monitoring-location/selectors/flood-data-selector.js
index cd0571db61275647c1de11677c99bc5049529b51..c093e5a8fcb998e9e6afb9aa320b9276528237fd 100644
--- a/assets/src/scripts/monitoring-location/selectors/flood-data-selector.js
+++ b/assets/src/scripts/monitoring-location/selectors/flood-data-selector.js
@@ -2,7 +2,7 @@ import {createSelector} from 'reselect';
 
 import config from 'ui/config';
 
-import {getIVPrimaryParameter} from './hydrograph-data-selector';
+import {getIVParameter} from './hydrograph-data-selector';
 
 export const getFloodStages = state => state.floodData.stages || [];
 
@@ -33,7 +33,7 @@ export const hasFloodLevels = createSelector(
  */
 export const showFloodLevels = createSelector(
     hasFloodLevels,
-    getIVPrimaryParameter,
+    getIVParameter('primary'),
     (hasFloodLevels, parameter) => hasFloodLevels && parameter && parameter.parameterCode === config.GAGE_HEIGHT_PARAMETER_CODE
 );
 
diff --git a/assets/src/scripts/monitoring-location/selectors/hydrograph-data-selector.js b/assets/src/scripts/monitoring-location/selectors/hydrograph-data-selector.js
index f0e0ec006772c186e4951618fed2ac9f85e8f657..1d3684aa748460b6dce5311095d5a0d8134c1cac 100644
--- a/assets/src/scripts/monitoring-location/selectors/hydrograph-data-selector.js
+++ b/assets/src/scripts/monitoring-location/selectors/hydrograph-data-selector.js
@@ -21,7 +21,7 @@ export const getTimeRange = memoize((timeRangeKind) => state => state.hydrograph
 
 /*
  *Returns a selector function which returns the IV data for the dataKind
- * @param {String} dataKind - 'primary' or 'compare'
+ * @param {String} dataKind - 'primary', 'secondary' or 'compare'
  * @return {Function}
  */
 export const getIVData = memoize((dataKind) => state => state.hydrographData[`${dataKind}IVData`] || null);
@@ -38,8 +38,8 @@ export const getStatisticsData = state => state.hydrographData.statisticsData ||
  * and is an Object containing the parameter code, name, description, and unit
  * @return {Function}
  */
-export const getIVPrimaryParameter = createSelector(
-    getIVData('primary'),
+export const getIVParameter = dataKind => createSelector(
+    getIVData(dataKind),
     (ivData) => {
         let parameter = null;
         if (ivData) {
diff --git a/assets/src/scripts/monitoring-location/selectors/hydrograph-data-selector.test.js b/assets/src/scripts/monitoring-location/selectors/hydrograph-data-selector.test.js
index ea75eb453296832ab0ed60fafda054528c634595..3132b037133143d31cd0889893aa88f7d1aeaea8 100644
--- a/assets/src/scripts/monitoring-location/selectors/hydrograph-data-selector.test.js
+++ b/assets/src/scripts/monitoring-location/selectors/hydrograph-data-selector.test.js
@@ -1,6 +1,6 @@
 import config from 'ui/config';
 
-import {getThresholds, getTimeRange, getIVData, getStatisticsData, getIVPrimaryParameter,
+import {getThresholds, getTimeRange, getIVData, getStatisticsData, getIVParameter,
     getPrimaryMethods, getPrimaryMedianStatisticsData, getPrimaryMedianStatisticsValueRange
 } from './hydrograph-data-selector';
 
@@ -25,6 +25,24 @@ describe('monitoring-location/selectors/hydrograph-data-selectors', () => {
         }
     };
 
+    const TEST_SECONDARY_IV_DATA = {
+        parameter: {
+            parameterCode: '00065',
+            name: 'Gage height, feet',
+            description: 'Gage height, feet',
+            unit: 'ft'
+        },
+        values: {
+            '43043': {
+                points: [
+                    {value: '3.3', dateTime: 1613421000000},
+                    {value: '3.6', dateTime: 1613421900000},
+                    {value: '3.9', dateTime: 1613422800000}],
+                method: {methodID: '43043'}
+            }
+        }
+    };
+
     const TEST_COMPARE_IV_DATA = {
         parameter: {
             parameterCode: '00060',
@@ -135,15 +153,24 @@ describe('monitoring-location/selectors/hydrograph-data-selectors', () => {
             expect(getIVData('primary')({
                hydrographData: {
                    primaryIVData: TEST_PRIMARY_IV_DATA,
+                   secondaryIVData: TEST_SECONDARY_IV_DATA,
                    compareIVData: TEST_COMPARE_IV_DATA
                }
             })).toEqual(TEST_PRIMARY_IV_DATA);
             expect(getIVData('compare')({
                hydrographData: {
                    primaryIVData: TEST_PRIMARY_IV_DATA,
+                   secondaryIVData: TEST_SECONDARY_IV_DATA,
                    compareIVData: TEST_COMPARE_IV_DATA
                }
             })).toEqual(TEST_COMPARE_IV_DATA);
+            expect(getIVData('secondary')({
+                hydrographData: {
+                    primaryIVData: TEST_PRIMARY_IV_DATA,
+                    secondaryIVData: TEST_SECONDARY_IV_DATA,
+                    compareIVData: TEST_COMPARE_IV_DATA
+                }
+            })).toEqual(TEST_SECONDARY_IV_DATA);
         });
     });
 
@@ -163,15 +190,15 @@ describe('monitoring-location/selectors/hydrograph-data-selectors', () => {
         });
     });
 
-    describe('getIVPrimaryParameter', () => {
+    describe('getIVParameter', () => {
         it('Returns null if no IV levels are defined', () => {
-            expect(getIVPrimaryParameter({
+            expect(getIVParameter('primary') ({
                 hydrographData: {}
             })).toBeNull();
         });
 
         it('Returns the parameter from IV if defined', () => {
-            expect(getIVPrimaryParameter({
+            expect(getIVParameter('primary') ({
                 hydrographData: {
                     primaryIVData: TEST_PRIMARY_IV_DATA
                 }
diff --git a/assets/src/scripts/monitoring-location/selectors/hydrograph-state-selector.js b/assets/src/scripts/monitoring-location/selectors/hydrograph-state-selector.js
index ee41bb03ae4648e49b110919ad338e62f0fad10b..d6012c89ea81566823deb9e65d51cc379a9617c2 100644
--- a/assets/src/scripts/monitoring-location/selectors/hydrograph-state-selector.js
+++ b/assets/src/scripts/monitoring-location/selectors/hydrograph-state-selector.js
@@ -11,6 +11,7 @@ import {getPeriodOfRecord} from 'ml/parameter-code-utils';
  */
 export const isCompareIVDataVisible = state => state.hydrographState.showCompareIVData || false;
 export const isMedianDataVisible = state => state.hydrographState.showMedianData || false;
+export const isSecondaryIVDataVisible = state => state.hydrographState.showSecondaryIVData || false;
 export const getSelectedTimeSpan = state => state.hydrographState.selectedTimeSpan || null;
 export const getSelectedParameterCode = state => state.hydrographState.selectedParameterCode || null;
 export const getSelectedIVMethodID = state => state.hydrographState.selectedIVMethodID || null;
diff --git a/assets/src/scripts/monitoring-location/selectors/hydrograph-state-selector.test.js b/assets/src/scripts/monitoring-location/selectors/hydrograph-state-selector.test.js
index 84302231c384724838027472c9f93ad409aa075c..28cb3db7e37ca4c735a45de1e775e3f18c247e4f 100644
--- a/assets/src/scripts/monitoring-location/selectors/hydrograph-state-selector.test.js
+++ b/assets/src/scripts/monitoring-location/selectors/hydrograph-state-selector.test.js
@@ -1,6 +1,6 @@
 import config from 'ui/config';
 
-import {isCompareIVDataVisible, isMedianDataVisible, getSelectedTimeSpan, getSelectedParameterCode,
+import {isCompareIVDataVisible, isSecondaryIVDataVisible, isMedianDataVisible, getSelectedTimeSpan, getSelectedParameterCode,
     getSelectedIVMethodID, getGraphCursorOffset, getGraphBrushOffset, getInputsForRetrieval
 } from './hydrograph-state-selector';
 
@@ -22,6 +22,22 @@ describe('monitoring-location/selectors/hydrograph-state-selector', () => {
         });
     });
 
+    describe('isSecondaryIVDataVisible', () => {
+        it('returns false if no secondary parameter data should be shown on graph--ie, not in application state', () => {
+            expect(isSecondaryIVDataVisible({
+                hydrographState: {}
+            })).toBe(false);
+        });
+
+        it('Returns true if secondary parameter data should be shown on graph--ie, is true in application state', () => {
+            expect(isSecondaryIVDataVisible({
+                hydrographState: {
+                    showSecondaryIVData: true
+                }
+            })).toBe(true);
+        });
+    });
+
     describe('isMedianDataVisible', () => {
         it('returns false if no median data visible', () => {
             expect(isMedianDataVisible({
diff --git a/assets/src/scripts/monitoring-location/store/hydrograph-data.js b/assets/src/scripts/monitoring-location/store/hydrograph-data.js
index 30a6be974d33b91aa0d7afb7be61efb0c89fe711..b5efd99b277898b2fc0990677d47faf4dcdd1be8 100644
--- a/assets/src/scripts/monitoring-location/store/hydrograph-data.js
+++ b/assets/src/scripts/monitoring-location/store/hydrograph-data.js
@@ -206,6 +206,24 @@ export const retrievePriorYearIVData = function(siteno, {parameterCode, startTim
     };
 };
 
+/*
+ * Asynchronous Redux action to fetch the IV data for the second parameter on hydrograph using siteno, parameterCode and startTime/endTime
+ * @param {String} siteno
+ * @param {String} parameterCode
+ * @param {String} startTime - Epoch time
+ * @param {String} endTime - EpochTime
+ * @return {Function} that returns a Promise
+ */
+export const retrieveSecondParameterIVData = function(siteno, {parameterCode, startTime, endTime}) {
+    return function(dispatch) {
+        return dispatch(retrieveIVData(siteno, 'secondary', {
+            parameterCode: parameterCode,
+            startTime: DateTime.fromMillis(startTime, {zone: config.locationTimeZone}).toISO(),
+            endTime: DateTime.fromMillis(endTime, {zone: config.locationTimeZone}).toISO()
+        }));
+    };
+};
+
 /*
  * Asynchronous Redux action to fetch the median for siteno and parameterCode
  * @param {String} siteno
diff --git a/assets/src/scripts/monitoring-location/store/hydrograph-data.test.js b/assets/src/scripts/monitoring-location/store/hydrograph-data.test.js
index 8a84a68950e10a5c0628d72ab7d42c599ffacc90..3688543143eca984378ac70eb3b02539e3caadb1 100644
--- a/assets/src/scripts/monitoring-location/store/hydrograph-data.test.js
+++ b/assets/src/scripts/monitoring-location/store/hydrograph-data.test.js
@@ -20,7 +20,8 @@ import {
     hydrographDataReducer,
     retrieveHydrographData,
     retrieveStatistics,
-    retrievePriorYearIVData
+    retrievePriorYearIVData,
+    retrieveSecondParameterIVData
 } from './hydrograph-data';
 
 
@@ -456,6 +457,51 @@ describe('monitoring-location/store/hydrograph-data', () => {
         });
     });
 
+    describe('retrieveSecondParameterIVData', () => {
+        beforeEach(() => {
+            ivDataService.fetchTimeSeries =
+                jest.fn().mockReturnValue(Promise.resolve(JSON.parse(MOCK_IV_DATA)));
+            sensorThingsService.fetchDataFromSensorThings =
+                jest.fn().mockReturnValue(Promise.resolve(JSON.parse(MOCK_SENSOR_THINGS_DATA)));
+            config.ivPeriodOfRecord = {
+                '00060': {begin_date: '2010-01-01', end_date: '2020-01-01'}
+            };
+
+            return store.dispatch(retrieveHydrographData('11112222', 'USGS', {
+                    parameterCode: '00060',
+                    period: 'P7D',
+                    startTime: null,
+                    endTime: null,
+                    loadCompare: false
+                },
+                false
+            ));
+        });
+
+        it('Expects a call to retrieveSecondParameterIVData fetches the expected data', () => {
+            const currentTimeRange = store.getState().hydrographData.currentTimeRange;
+            return store.dispatch(retrieveSecondParameterIVData('11112222', {
+                parameterCode: '00060',
+                startTime: currentTimeRange.start,
+                endTime: currentTimeRange.end
+            })).then(() => {
+                const hydrographData = store.getState().hydrographData;
+
+                const mockIVCalls = ivDataService.fetchTimeSeries.mock.calls;
+                expect(mockIVCalls).toHaveLength(2);
+                expect(mockIVCalls[1][0]).toEqual({
+                    siteno: '11112222',
+                    parameterCode: '00060',
+                    period: undefined,
+                    startTime: '2021-02-03T12:00:00.000-06:00',
+                    endTime: '2021-02-10T12:00:00.000-06:00'
+                });
+
+                expect(hydrographData.secondaryIVData).toBeDefined();
+            });
+        });
+    });
+
     describe('retrieveStatistics', () => {
         beforeEach(() => {
             ivDataService.fetchTimeSeries =
diff --git a/assets/src/scripts/monitoring-location/store/hydrograph-state.js b/assets/src/scripts/monitoring-location/store/hydrograph-state.js
index bc5b09a5dcd4a1fc98d219b8b2c9241f7a454cd0..de21dcedf2096b9a2e1afc4bb2b280bf14f8b346 100644
--- a/assets/src/scripts/monitoring-location/store/hydrograph-state.js
+++ b/assets/src/scripts/monitoring-location/store/hydrograph-state.js
@@ -6,6 +6,7 @@ const GW_SHORTCUT_DURATIONS = config.GW_SHORTCUT_BUTTONS.map(button => button.ti
 export const INITIAL_STATE = {
     showCompareIVData: false,
     showMedianData : false,
+    showSecondaryIVData: false,
     selectedTimeSpan: 'P7D',
     selectedParameterCode: null,
     selectedIVMethodID: null,
@@ -25,6 +26,18 @@ export const setCompareDataVisibility = function(show) {
     };
 };
 
+/*
+ * Synchronous action to set the visibility of the secondary parameter data
+ * @param {Boolean} show
+ * @return {Object} - Redux action
+ */
+export const setSecondaryIVDataVisibility = function(show) {
+    return {
+        type: 'SET_SECONDARY_IV_DATA_VISIBILITY',
+        show
+    };
+};
+
 /*
  * Synchronous action to set the visibility of the median data
  * @param {Boolean} show
@@ -130,6 +143,12 @@ export const hydrographStateReducer = function(hydrographState = INITIAL_STATE,
                 showMedianData: action.show
             };
 
+        case 'SET_SECONDARY_IV_DATA_VISIBILITY':
+            return {
+                ...hydrographState,
+                showSecondaryIVData: action.show
+            };
+
         case 'SET_SELECTED_PARAMETER_CODE':
             hasIVData = config.ivPeriodOfRecord && action.parameterCode in config.ivPeriodOfRecord;
             hasGWData = config.gwPeriodOfRecord && action.parameterCode in config.gwPeriodOfRecord;