LOCATION.-- Lat 41°21'54", long 89°34'08" (NAD of 1927), at northeast corner of sec. 21, T.16 N., R.8 E., Bureau County, Hydrologic Unit 07130001, on left bank at upstream side of bridge on U. S. Highways 6 and 34, 0.5 mi east of Wyanet.

DRAINAGE AREA.-- 83.3 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: March 1936 to September 1966.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1979-91.

GAGE.-- Water-stage recorder. Datum of gage is 573.14 ft above NGVD of 1929 (levels by Corps of Engineers). Prior to Oct. 1, 1937, wire-weight gage at same site at datum 30.00 ft lower. Oct. 1, 1937, to Feb. 20, 1939, wire-weight gage at present site and datum.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 6,620 ft³/s, July 8, 1951, gage height 12.48 ft, from rating curve extended above 3,900 ft³/s; maximum gage height, 12.90 ft Jan. 24, 1938; no flow at times in many years.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum stage known, 14.5 ft, Oct. 11, 1931.