Warning: Javascript must be enabled to use all the features on this page!

Page Loading - Please Wait...

Click to hideNews Bulletins

Water-Year Summary for Site 06421500

Click to hide Water-Year Summary instructions and information
  • 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.
Available Parameters
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2020: 2019-10-01 to 2020-09-30

Print this page
USGS Water-Year Summary 2020
LOCATION - Lat 43°56'31.61", long 102°51'12.50" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 SW 1/4 sec.19, T.1 S., R.11 E., Pennington County, SD, Hydrologic Unit 10120110, on right bank at downstream side of bridge, 2 mi southeast of Farmingdale, and 4.8 mi downstream from Antelope Creek.
DRAINAGE AREA - 603 mi².
REVISIONS HISTORY - WDR SD-10-1: Drainage area. The maximum discharge for calendar and water year 2010 has been revised to 3,750 ft³/s, May 24, 2010, from rating curve extended above 2,700 ft³/s, gage height 12.69 ft. Revised daily discharges, in cubic feet per second, for period in May 2010 are given below. These figures supersede those published in the 2010 Water Year Summary.
May 24 1,250
May 25 1,750
May 26   864
PERIOD OF RECORD - July 1946 to current year. October 1989 to September 1990, operated as a partial-record crest-stage gage.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 2,699.74 ft above NAVD of 1988. Prior to Sept. 19, 1947, nonrecording gage at same site and 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 Aug. 31, 2016 to Oct. 24, 2016, which are fair, and estimated discharges, which are poor, unless otherwise noted.  Flow regulated by Pactola Dam 67 mi upstream since Aug. 22, 1956 (reservoir filled from August 1956 to June 1963). Diversions of irrigation of about 10,000 acres upstream from station. Satellite data-collection platform at station.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge prior to regulation, 2,640 ft³/s, June 21, 1947, gage height, 8.40 ft; maximum discharge after regulation, 7,320 ft³/s, June 10, 1972, from rating curve extended above 400 ft³/s, on basis of contracted-opening and flow-over-road measurement of peak flow, gage height, 11.85 ft, from floodmarks; minimum daily discharge, 0.00 ft³/s, May 30, 1969, no flow at times in some years.