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Water-Year Summary for Site 05586100
U.S. Army Corps of Engineer's water-stage recorder and satellite telemeter, and crest-stage gage. Datum of gage is 418.00 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers) (417.65 ft NAVD 1988).
Prior to Nov. 25, 1992; and Oct. 1, 1994, to current: auxiliary gage (05585500) at site 10.0 mi upstream. Nov. 25, 1992, to Sept. 30, 1994: auxiliary gage operated at this site (05586100).
Occasional regulation at low flow by navigation dam at La Grange.
Since Jan. 17, 1900, flow has included diversion from Lake Michigan through Chicago Sanitary and Ship Canal.
Suspended-sediment samples were collected by local observers generally twice weekly with additional samples collected during high runoff periods. Since February 1994, samples used to compute sediment record have been collected at upstream side Rt. 106 bridge at Florence at mile 56.
Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 123,000 ft³/s, May 27, 1943, gage height, 28.50 ft, site then in use; maximum gage height, 28.61 ft, May 26, 1943, site then in use; minimum daily discharge, 1,330 ft³/s, Sept. 2, 1984.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 3,720 mg/L, Apr. 14, 1981; minimum daily, 13 mg/L, Nov. 14-15, 2007.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 410,000 tons, June 4, 1980; minimum daily, 172 tons, Sept. 2, 1984.