LOCATION.-- Lat 42°07'23", long 89°15'21" (NAD of 1927), in NW1/4SW1/4 sec.32, T.25 N., R.11 E., Ogle County, Hydrologic Unit 7090005, at bridge on State Highway 72, 0.3 mi south of Byron, 1.2 mi upstream from Mill Creek, 1.3 mi downstream from Stillman Creek, and at mile 120.3.

DRAINAGE AREA.-- 7,990 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: May 2000 to current year.

STAGE: Water years 2000 to current year.

SURFACE-WATER QUALITY

CHEMICAL: 1978-1988. Additional data for water years 1964, 1971-1977 are published in Water-Resources Investigations 78-23 and 79-24 as site P 14.

PRECIPITATION: October 2004 to current year.

GAGE.-- Water-stage recorder, phone telemeter, and raingage. Datum of gage is 666.13 ft above NGVD of 1929 (666.00 ft NAVD 1988).

REMARKS.--Collection, computation, and publication of precipitation data do not necessarily conform to standards used by the National Weather Service. Precipitation data could be subject to error for days with freezing and/or thawing of precipitation.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 35,400 ft³/s, June 14, 2000, gage-height, 16.12 ft; minimum discharge, 1,190 ft³/s, September 9, 2003.

PRECIPITATION: Maximum daily total, 1.48 in., August 18.