LOCATION.-- Lat 40°39'47", long 88°56'23" (NAD of 1927), in NE1/4NW1/4 sec.1, T.25 N., R.2 E., McLean County, Hydrologic Unit 07130004, on right bank 1,300 ft downstream from dam at Lake Bloomington, 2.1 mi upstream from mouth, and 4 mi northeast of Hudson.

DRAINAGE AREA.-- 68.6 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1930 to September 1958.

REVISED RECORDS.-- WSP 1238: Drainage area. WSP 1508: 1945.

GAGE.-- Water-stage recorder and artificial control. Datum of gage is 678.05 ft above NGVD of 1929 (677.91 ft NAVD 1988). Prior to Oct. 1, 1940, water-stage recorder in pumping plant just upstream from dam at datum 700.00 ft above NGVD of 1929 (699.86 ft NAVD 1988). Recorder at former site used as auxiliary gage to give stage of lake.

REMARKS.-- Flow regulated by Lake Bloomington (area of lake at level of crest of spillway, 531 acres). Water is diverted from lake by pumping for municipal supply of Bloomington. Discharge past gage is made up of discharge through spillway, seepage through dam, runoff from area below dam (0.4 mi²), and return flow from water diverted from lake for use at pumping plant and not otherwise measured. The last three items were not included in records prior to Oct. 1, 1940. Discharges adjusted for storage and pumpage, but not for evaporation and seepage.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 304 ft³/s Apr. 17, 1939, gage height, 3.93 ft; no flow Sept. 19, 1956.