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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2025
06401500 CHEYENNE RIVER BELOW ANGOSTURA DAM, SD
LOCATION - Lat 43°20'42", long 103°26'12" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 NW 1/4 sec.20, T.8 S., R.6 E., Fall River County, SD, Hydrologic Unit 10120109, on right bank 800 ft downstream from Angostura Dam, 4.8 mi upstream from Fall River, and 6.5 mi southeast of Hot Springs.
DRAINAGE AREA - 9,097 mi² of which 5 mi² probably is noncontributing.
REVISIONS HISTORY - WSP 1309: 1946(M). WDR SD-78-1: 1962(M), 1967(M), 1971(M). WDR SD-10-1: Drainage area. Peak gage height for May 15, 2024, revised due to no peak gage height associated with peak discharge.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1945 to current year, seasonal records only beginning October 1978. Monthly discharge only for some periods, published in WSP 1309.
GAGE - Water-stage recorder. Datum of gage is 3,060.30 ft above NAVD88. Prior to Oct. 17, 1946, nonrecording gage and Oct. 17, 1946, to Jul. 7, 1953, water-stage recorder at site 4.8 mi downstream at different datum.
REMARKS -
Accuracy of records for water years prior to 2014 are noted in the individual Annual Data Reports for those water years. For water years 2014 onward, records good except for June 5-9, 2015, Feb. 1, 2018 to Apr. 26, 2018, which are fair and estimated discharges, which are poor, unless otherwise noted. Record quality ratings may not be included in the water-year summary for approved records newer than 09/30/2018. Record quality is still being rated internally. For questions about record quality ratings, please send email to gs-w-sd_NWISWeb_Data_Inquiries@usgs.gov. Flow regulated by Angostura Dam 800 ft upstream since October 1949. Bureau of Reclamation satellite data-collection platform at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 30,300 ft³/s, from rating curve extended above 12,000 ft³/s, May 20, 1978, gage height, 15.97 ft; minimum daily discharge 0.00 ft³/s, Oct. 9, 1949 to Feb. 5, 1950 and Apr. 28, Aug. 26, 30, 1951.
