USGS Water-Year Summary 2022
06471500 ELM RIVER AT WESTPORT, SD
LOCATION - Lat 45°39'22", long 98°29'48" referenced to North American Datum of 1927, in SW 1/4 NW 1/4 sec.12, T.125 N., R.64 W., Brown County, SD, Hydrologic Unit 10160004, on upstream side of county highway bridge, 0.5 mi north of Westport, 9.3 mi downstream from Willow Creek, and 30.4 mi upstream from mouth.
DRAINAGE AREA - 1,505 mi² of which 295 mi² probably is noncontributing.
- WDR SD-10-1: Drainage area.
PERIOD OF RECORD - Oct. 1945 to current year.
Water-stage recorder. Datum of gage is 1,310.04 feet above the North American Vertical Datum of 1988 (NAVD88) and 1,309.3 feet above the National Geodetic Vertical Datum of 1929 (NGVD29).
Previous Datums are as follows:
Prior to Aug. 6, 1951, and Apr. 8 to Sept. 9, 1952, nonrecording gage 12 feet upstream at same datum.
Aug. 6, 1951, to Apr. 7, 1952, water-stage recorder at present site and datum.
EXTREMES FOR PERIOD OF RECORD - Minimum daily discharge, 0.00 ft³/s, Jan. 27, 1946, no flow for many days in most years prior to 1960.