USGS Water-Year Summary 2020
05536995 CHICAGO SANITARY AND SHIP CANAL AT ROMEOVILLE, IL
LOCATION - Lat 41°38'27", long 88°03'34" referenced to North American Datum of 1983, in SW 1/4 SE 1/4 SW 1/4 sec.35, T.37 N., R.10 E., Will County, IL, Hydrologic Unit 07120004, on left bank 40 ft upstream from bridge on Romeoville Road (135th Street) in Romeoville, 5.2 mi upstream from Lockport Lock and Dam, and at mile 6.2.
DRAINAGE AREA - 739 mi² of which 739 mi² probably is noncontributing.
- WDR IL-86-2: 1985. WDR IL-89-2: 1986. WDR IL-92-2: 1986-89. WDR-US-2008 and SIR 2006-5018:1997-1999.
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1984 to September 2005 (discontinued).
STAGE: October 1993 to May 2006 and February 2009 to current.
CHEMICAL: Water years 1987-92 and 1999 to 2001.
WATER TEMPERATURE: Water years 1974-77.
GAGE - Water-stage recorder. Datum of gage is 551.76 ft above NAVD of 1988 (from GPS levels based on a National Geodetic Survey bench mark). Prior to water year 2006, datum published as 551.89 ft above NGVD of 1929 (from land survey based on U.S. Army Corps of Engineers bench mark).
EXTREMES FOR PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 19,466 ft³/s, Feb. 21, 1997, gage-height, 23.95 ft; maximum gage-height, 26.43 ft, Feb. 4, 1996, discharge, 2,876 ft³/s; no flow or periods of reverse flow at times in most years.