Warning: Javascript must be enabled to use all the features on this page!


Page Loading - Please Wait...

Click to hideNews Bulletins

Water-Year Summary for Site 05443500

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.
Available Parameters
00060 Discharge(Mean)  
00065 Gage height(Mean)  

Water year 2020: 2020-10-01 to 2021-09-30
 

Print this page
USGS Water-Year Summary 2020
05443500 ROCK RIVER AT COMO, IL
LOCATION - Lat 41°46'20", long 89°44'44" referenced to North American Datum of 1983, in NW 1/4 NW 1/4 NW 1/4 sec.31, T.21 N., R.7 E., Whiteside County, IL, Hydrologic Unit 07090005, downstream side of Route 30 bridge, slightly left of the center, 0.5 mi upstream from Como, 2.5 mi downstream from Rock Falls, 3 mi upstream from Elkhorn Creek, and at mile 68.5.
DRAINAGE AREA - 8,753 mi².
REVISIONS HISTORY - WSP 1308: 1915(M), 1917-18(M), 1922(M), 1924(M), 1926(M), 1928(M), 1931-32(M), 1934(M). WDR IL-79-1: Drainage area. WDR IL-97-l: 1996 (Dec. 12-23).
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
  DISCHARGE: March to December 1905, October 1914 to September 1971,
    October 1977 to September 1986. Water years 1987-90, seven-month period
    (March to September). October 1990 to current.
    Published as "at Sterling" 1905-6 and as "at Lyndon" 1914-34.
    Records published for both sites December 1933 to September 1934.
    Monthly discharge only for some periods, published in WSP 1308.
  STAGE: Water years 1994 to current.
  PARTIAL RECORD: Annual maximum, water years 1972-77.
SURFACE-WATER QUALITY
  CHEMICAL: Water years 1978-91 and 2009-2011.
GAGE - Water-stage recorder and U.S. Army Corps of Engineers satellite telemeter. Datum of gage is 603.03 ft. NAVD 1988 and is located on State Route 30 bridge over Rock River. September 30, 1934 to September 17, 2014, datum of 606.83 ft above NGVD of 1929 (606.65 ft NAVD 1988); site located 0.7 mi upstream, at datum 0.62 ft. higher. November 24, 1914 to September 30, 1934, nonrecording gage at Lyndon, 15.8 mi downstream at datum 22.46 ft lower. January 6, 1905 to February 17, 1906, nonrecording gage at Sterling, 3.7 mi upstream at different datum.
REMARKS - Some diurnal fluctuation caused by dam and powerplants upstream from station. 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, 59,700 ft³/s, April 21, 1973, gage height, 15.66 ft , site and datum then in use; maximum gage height, 17.51 ft, February 7, 1938, ice jam, site and datum then in use; minimum discharge, 390 ft³/s, July 27, 2003 and July 12, 2005, result of regulation.