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USGS Water-Year Summary 2024
05572000 SANGAMON RIVER AT MONTICELLO, IL
LOCATION - Lat 40°01'52.2", long 88°35'21.0" referenced to North American Datum of 1983, in NE 1/4 SW 1/4 sec.12, T.18 N., R.5 E., Piatt County, IL, Hydrologic Unit 07130006, on right downstream side of highway bridge, 0.5 mi west of Monticello, and at mile 162.2.
DRAINAGE AREA - 550 mi².
REVISIONS HISTORY - WSP 525: 1920. WSP 1115: 1946-47. WSP 1208: 1915-16, 1918-20, 1927, 1929, 1939. WSP 1508: 1908(M), 1917, 1928(M). WDR IL-81-2: 1909(P), 1912(P), 1915(P), 1919-32(P), 1935(P), 1937-38(P), 1940-41(P), 1944(P), 1946-47(P). WDR IL-89-2: 1988.
Revisions: Gage datum was updated to 625.55 ft NAVD88 on June 6, 2023, based on a GNSS Level II survey using GEOID18.
Revisions: Gage datum was updated to 625.55 ft NAVD88 on June 6, 2023, based on a GNSS Level II survey using GEOID18.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: February 1908 to December 1912, June 1914 to current. Monthly discharge
only for some periods, published in WSP 1308. Published as "near
Monticello" 1910-12.
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1990-92, 1997-98, and 2001-2005.
MISCELLANEOUS: Water years 2004 and 2005; Contaminants in streambed sediments, July
1996; contaminants in fish tissue, July 1996; streambank sediment size, October
1997; streambed sediment size, October 1997.
BIOLOGICAL
ALGAE: Water years 1996-98 and 2002-05.
BENTHIC MACROINVERTEBRATES: Water years 1996-98 and 2002-05.
FISH: Water years 1997-98 and 2002-05.
HABITAT: Water years 1996-98 and 2002-05.
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: February 1908 to December 1912, June 1914 to current. Monthly discharge
only for some periods, published in WSP 1308. Published as "near
Monticello" 1910-12.
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1990-92, 1997-98, and 2001-2005.
MISCELLANEOUS: Water years 2004 and 2005; Contaminants in streambed sediments, July
1996; contaminants in fish tissue, July 1996; streambank sediment size, October
1997; streambed sediment size, October 1997.
BIOLOGICAL
ALGAE: Water years 1996-98 and 2002-05.
BENTHIC MACROINVERTEBRATES: Water years 1996-98 and 2002-05.
FISH: Water years 1997-98 and 2002-05.
HABITAT: Water years 1996-98 and 2002-05.
GAGE - Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 625.55 ft above NAVD of 1988. Prior to Sept. 30, 1964, nonrecording gage at site 0.2 mi downstream at same datum. Oct. 1, 1964, to Oct. 22, 1971, nonrecording gage at present site and datum.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.
EXTREMES FOR PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 19,000 ft³/s, Oct. 4, 1926, gage height, 18.50 ft, from graph based on gage readings, site then in use; maximum gage height, 19.06 ft, Apr. 13, 1994, discharge, 15,900 ft³/s; no flow for several days in 1988 and many days in 2012.
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 19,000 ft³/s, Oct. 4, 1926, gage height, 18.50 ft, from graph based on gage readings, site then in use; maximum gage height, 19.06 ft, Apr. 13, 1994, discharge, 15,900 ft³/s; no flow for several days in 1988 and many days in 2012.
