USGS Water-Year Summary 2021
05576022 SOUTH FORK SANGAMON RIVER BELOW ROCHESTER, IL
LOCATION - Lat 39°45'13", long 89°33'56" referenced to North American Datum of 1927, in NW 1/4 SE 1/4 sec.8, T.15 N., R.4 W., Sangamon County, IL, Hydrologic Unit 07130007, on right bank at upstream side of bridge on West Main Road, 1.7 mi northwest of Rochester, 3.4 mi upstream from Black Branch, 1.2 mi downstream from Horse Creek, and at mile 6.2. This auxiliary gage is 1.2 mi. downstream from the base gage South Fork Sangamon River at Rochester (05576000).
DRAINAGE AREA - 870 mi².
- WDR IL-79-2: Drainage area.
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
STAGE: October 1993 to current.
CHEMICAL: Water years 1978 to 1991. Additional chemical data for water years 1972-77 are published in Water-Resources Investigations 78-23 and 79-24 as site EO 01.
MISCELLANEOUS: Water temperature, water year 1977.
GAGE - Water-stage recorder, satellite telemeter, and crest-stage gage. Datum of gage is 511.30 ft above NGVD of 1929 (510.98 ft NAVD 1988). Prior to May 19, 1950, non-recording gage 5 miles downstream at same datum. May 19, 1950 to April 29, 1975, non-recording gage at current site and datum.
EXTREMES FOR PERIOD OF RECORD -
STAGE: Maximum gage height, 32.65 ft, May 13, 2002; minimum gage height, 3.15 ft, Oct. 15, 1995.