USGS Water-Year Summary 2023
06847500 Sappa Creek near Stamford, Nebr.
LOCATION - Lat 40°07'06", long 99°31'01" referenced to North American Datum of 1983, in SE 1/4 SE 1/4 sec.19, T.2 N., R.20 W., Harlan County, NE, Hydrologic Unit 10250011, on right downstream side of county bridge, 4.1 mi southeast of Stamford.
DRAINAGE AREA - 3,840 mi² of which 470 mi² probably is noncontributing.
REVISIONS HISTORY - WSP 1919: 1960. WDR NE-71-1: Calendar year totals. WDR NE-82-1: 1979(M). WDR NE-94-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - October 1945 to current year. Monthly discharge only for some periods, published in WSP 1310.
GAGE - Water-stage recorder with satellite telemetry. Datum of gage is 1966.53 ft above North American Vertical Datum of 1988. Oct. 1, 1945 to Sept. 30, 2007, water-stage recorder 2.6 mi upstream at datum 1981.31 ft above National Geodetic Vertical Datum of 1929. Oct. 1, 2007 to Oct. 4, 2009, water-stage recorder 6.6 mi upstream at datum 2001.02 ft above North American Vertical Datum of 1988.
EXTREMES FOR PERIOD OF RECORD - Maximum peak flow, 43,400 ft³/s, June 24, 1966, from combined peak flow measurements of contracted-opening and flow over road, gage height, 22.13 ft, from floodmark, site and datum then in use.