LOCATION.-- Lat 42°26'17", long 89°10'29", (NAD of 1927) in SE1/4SW1/4 sec.12, T.28 N., R.11 E., Winnebago County, Hydrologic Unit 7090003, on left bank on upstream side of bridge, next to the Rivers Edge Campsite, 1.5 mi downstream from Sugar Creek, 7 mi upstream from confluence with Rock River, and at mile 7.1.

DRAINAGE AREA.-- 2,556 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: Oct. 1939 to Sept. 1958 (published as "at Shirland"), July 2002 to current year.

STAGE: July 2002 to current year.

PARTIAL RECORD: Annual maximum, water years 1959 to 1971 (published as "at Shirland").

GAGE.-- Water-stage recorder, acoustic-velocity meter, phone telemeter and crest-stage gage. Datum of gage is 711.79 ft above NGVD of 1929. October 1939 to September 1971, nonrecording gage at site 1.5 miles upstream "at Shirland" (05437000) at same datum. Records considered equivalent.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 16,600 ft³/s, April 4, 1959, gage-height, 17.45 ft at site then in use; minimum daily discharge, 335 ft³/s, Sept. 7, 14, 15, 1958.