USGS Water-Year Summary 2021
06453020 MISSOURI RIVER BELOW GREENWOOD, SD
LOCATION - Lat 42°54'19", long 98°20'58" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 NE 1/4 sec.01, T.93 N., R.64 W., Charles Mix County, SD, Hydrologic Unit 10170101, on left bank 2.0 mi downstream from Greenwood and 1.3 mi downstream from the mouth of Slaughter Creek.
PERIOD OF RECORD - October 1989 to current year.
GAGE - Water-stage recorder. Datum of gage is 1,201 feet above NAVD88. Prior to conversion to NAVD 88, datum was published as 1,200.00 ft above NGVD29.