Click
to
hide
Water-Year
Summary
instructions
and
information
- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
06898000 Thompson River at Davis City, IA
LOCATION - Lat 40°38'25", long 93°48'29" referenced to North American Datum of 1983, in NE 1/4 SE 1/4 SE 1/4 sec.35, T.68 N., R.26 W., Decatur County, IA, Hydrologic Unit 10280102, on right bank 15 ft downstream from bridge on U.S. Highway 69 in Davis City, 3.1 mi upstream from Dickersons Branch, and 5.8 mi upstream from Iowa-Missouri state line.
DRAINAGE AREA - 701 mi².
REVISIONS HISTORY - WSP 1240: 1918, 1920-1921(M), 1922-1924, 1925(M), 1946-1947(M). WSP 1440: Drainage area. WSP 1710: 1957.
SURFACE-WATER RECORDS
PERIOD OF RECORD - Discharge records from May 1918 to July 1925, July 1941 to current year. Prior to October 1918, published as "Grand River." May 1918 to July 1925, monthly mean discharge for some periods published in WSP 1310.
GAGE -
Water-stage recorder. Datum of gage is 874.37 ft above North American Vertical Datum of 1988. May 14, 1918, to July 2, 1925, and July 14, 1941, to February 24, 1942, non-recording gage at same site at datum 876.04 ft NGVD29; February 25, 1942, to February 8, 1967, water-stage recorder at same site at datum 876.04 ft NGVD29.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IA Water Science Center.
EXTREMES OUTSIDE PERIOD OF RECORD - Flood of August 8, 1885, reached a stage of 22.8 ft, datum in use prior to February 9, 1967, from high-water mark, discharge 30,000 ft³/s.
WATER-QUALITY RECORDS
PERIOD OF RECORD - Water years 1968-1973.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Daily instantaneous values collected in conjunction with suspended-sediment samples, October 1968 to September 1973, records fragmentary.
WATER TEMPERATURE: Daily instantaneous values collected in conjunction with suspended-sediment samples, April 1968 to September 1973, records fragmentary.
SUSPENDED-SEDIMENT CONCENTRATION AND DISCHARGE: May 1949 to June 1954, April 1968 to September 1973. Prior to April 1968, suspended-sediment discharge records only, provided by U.S. Army Corps of Engineers.
