Does the nwis base url need to be updated?
I needed to do this to avoid getting a 503:
dRurl <- dataRetrieval:::constructNWISURL(service="iv",
parameterCd="00065",
siteNumbers = "07378500",
startDate = "2017-08-24",
endDate = "2017-09-01")
dRquery <- strsplit(dRurl, '[?]')[[1]][2]
dRurl <- sprintf('https://waterservices.usgs.gov/nwis/iv/?%s', dRquery) # the DR base URL is 503'ing
dataRetrieval::importWaterML1(dRurl, tz = "America/New_York")
works: https://waterservices.usgs.gov/nwis/iv/?format=rdb,1.0&sites=07378500&startDT=2017-08-24&endDT=2017-09-01¶meterCd=00065 is 503: https://nwis.waterservices.usgs.gov/nwis/iv/?format=rdb,1.0¶meterCd=00065&sites=07378500&startDT=2017-08-24&endDT=2017-09-01