LOCATION.-- Lat 41°55'46", long 87°50'40" (NAD of 1927), in NW1/4SW1/4 sec. 26, T. 40 N., R. 12 E., Cook County, Hydrologic Unit 07120004, on downstream side of Grand Avenue bridge in River Grove, and at mile 55.1. | |
DRAINAGE AREA.-- 451 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
PARTIAL RECORD: Annual maximum, water years 1960 to 1977. | |
GAGE.-- Crest-stage gage. Datum is 612.93 ft above NGVD of 1929. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 3620 ft3/sec, April 2, 1960 and June 11, 1967, gage height, 7.58 ft. | |