USGS Water-Year Summary 2020
06441000 BAD RIVER NEAR MIDLAND, SD
LOCATION - Lat 44°04'02", long 101°09'37.6" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.07, T.1 N., R.25 E., Haakon County, SD, Hydrologic Unit 10140102, on right bank at downstream side of bridge on State Highway 63, 0.4 mi southwest of Midland, 2.0 mi upstream from Mitchell Creek, and 3.7 mi upstream from Ash Creek.
DRAINAGE AREA - 1,466 mi².
- WDR SD-10-1: Drainage area.
PERIOD OF RECORD - Oct. 1945 to Sept. 2006 and Oct. 2014 to current, (continuous-record gaging station). 1980-2006 and 2014 (high-flow station only), Oct. 2006 to Sept. 2012 (crest-stage partial record). Prior to Feb. 1946 monthly discharge only, published in WSP 1309.
GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 1,850.65 ft above NAVD88. Datum was converted to NAVD88 datum using the National Geodetic Surveys VDATUM transformation tool. Prior to conversion to NAVD88 on Oct. 1, 2019 datum was published as 1,849.14 ft above NGVD29. Prior to Feb. 21, 1961, nonrecording gage, and Feb. 21, 1961 to June 14, 1967, water-stage recorder at site 4.2 mi downstream at datum 15.72 ft lower. June 15 to July 26, 1967, nonrecording gage at site 30 ft upstream and July 27, 1967 to June 14, 1971, water-stage recorder at site 60 ft upstream, both at present datum.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 29,400 ft³/s, June 15, 1967, gage height, 24.44 ft (from floodmarks), 20.10 ft at former site and datum (from floodmarks), from rating curve extended above 16,000 ft³/s; no flow for many days in each year.