LOCATION.-- Lat 42°28'19", long 88°08'49" (NAD of 1927), in NW1/4NE1/4 sec.14, T.46 N., R.9 E., Lake County, Hydrologic Unit 07120006, on right bank 30 ft downstream from bridge on State Highway 173, at dredged channel outlet of Channel Lake, 0.8 mi southwest of natural outlet, and 3 mi west of Antioch.

PERIOD OF RECORD.--

STAGE: October 1939 to current year.

GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 733.00 ft above NGVD of 1929 (levels by Illinois Department of Transportation). Prior to Oct. 1, 1971, at datum 2.21 ft higher.

REMARKS.-- Stage regulated by Stratton Lock and Dam (previously known as McHenry Dam).

EXTREMES FOR PERIOD OF RECORD.--

STAGE: Maximum gage height, 8.29 ft, present datum, Apr. 6, 1960; minimum, 1.65 ft, Jan. 25, 26, 1977.