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USGS Water-Year Summary 2024
05576500 SANGAMON RIVER AT RIVERTON, IL
LOCATION - Lat 39°50'35.26", long 89°32'50.92" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 sec.16, T.16 N., R.4 W., Sangamon County, IL, Hydrologic Unit 07130008, at right abutment on former U.S. Highway 36 bridge in Riverton, 2.2 mi. downstream from Sugar Creek, 5.6 mi. upstream from Fancy Creek, and at mile 83.1.
DRAINAGE AREA - 2,618 mi².
REVISIONS HISTORY -
WSP 1208: 1908-9, 1921-22, 1926-27, 1947. WDR IL-75-1: Drainage area.
Revisions: Discharge for June 24 and July 14, 2018 was revised on Apr. 16, 2020 to fill gaps in the record.
Revisions: Discharge for July 6-7, 15, and 18-20, 2019 was revised on Apr. 16, 2020 to gaps in the record.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: February 1908 to December 1912, August 1914 to September 1956,
and January 1986 to current.
STAGE: Water years 1994 to current.
PARTIAL RECORD: Annual maximum, water years 1957-85.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1978-91.
MISCELLANEOUS: Water years 1998 and 2002.
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: February 1908 to December 1912, August 1914 to September 1956,
and January 1986 to current.
STAGE: Water years 1994 to current.
PARTIAL RECORD: Annual maximum, water years 1957-85.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1978-91.
MISCELLANEOUS: Water years 1998 and 2002.
GAGE - Water-stage recorder, U.S. Army Corps of Engineers satellite telemeter, and crest-stage gage. Datum of gage is 508.00 ft above NAVD of 1988. Prior to Aug. 14, 1934, chain gage on old Wabash Railway bridge (currently Norfolk and Western Railway bridge), 1,450 ft downstream, at datum 5.61 ft lower.
REMARKS - Some regulation by municipal reservoirs at Decatur (since 1922) and at Springfield (since 1934).
Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.
EXTREMES OUTSIDE PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE: The high water of 1883 reached a stage of approximately 32 ft with respect to the gage at the old Wabash Railway bridge. The high water of 1875 is said to have been about one-half foot lower.
SURFACE-WATER DISCHARGE AND STAGE: The high water of 1883 reached a stage of approximately 32 ft with respect to the gage at the old Wabash Railway bridge. The high water of 1875 is said to have been about one-half foot lower.
EXTREMES FOR PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 68,700 ft³/s, May 19, 1943, gage height, 31.52 ft, from graph based on gage readings; minimum daily discharge, 3.0 ft³/s, Oct. 3-15, 1914. Maximum gage height, 32.04 ft., Oct. 4, 1926.
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 68,700 ft³/s, May 19, 1943, gage height, 31.52 ft, from graph based on gage readings; minimum daily discharge, 3.0 ft³/s, Oct. 3-15, 1914. Maximum gage height, 32.04 ft., Oct. 4, 1926.
