USGS Water-Year Summary 2020
06442996 LAKE FRANCIS CASE AT CHAMBERLAIN, SD
LOCATION - Lat 43°48'58", long 99°19'37" referenced to North American Datum of 1927, in NW 1/4 NE 1/4 NW 1/4 sec.15, T.104 N., R.71 W., Brule County, SD, Hydrologic Unit 10140101, on right bank of Lake Francis Case, Missouri River at west end I-90 Loop bridge, 0.50 mile downstream from American Creek Bay.
PERIOD OF RECORD - October 1988 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,301.00 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 1,300 ft above NGVD29. Prior to Oct. 1, 1993, at datum 0.24 ft higher.