LOCATION.-- Lat 41°20'05", long 89°22'55" (NAD of 1983), in NW1/4NE1/4 sec.31, T.16 N., R.10 E., Bureau County, Hydrologic Unit 07130001, on left bank at downstream side of bridge on County Road 1300N, 0.5 mi downstream from Brush Creek, 2.5 mi upstream from mouth, and 3.5 mi north of Bureau.

DRAINAGE AREA.-- 99.0 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: March 1936 to September 1966.

PARTIAL RECORD: Annual maximum, water years 1967 to current.

GAGE.-- Crest-stage gage. Datum of gage is 484.45 ft above NGVD of 1929 (levels by Corps of Engineers) (484.21 ft NAVD 1988). Prior to Oct. 1, 1939, nonrecording gage at same site at datum 30.00 ft lower. Oct. 1, 1939 to Apr. 9, 1941, nonrecording gage at same site and datum.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 9,260 ft³/s, Feb. 21, 1997, gage height, 17.09 ft; maximum gage height, 17.39 ft, Jan. 24, 1938, present datum, discharge, 6,200 ft³/s, from rating curve extended above 2,300 ft³/s; no flow for several days in most years.