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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
05435500 PECATONICA RIVER AT FREEPORT, IL
LOCATION - Lat 42°18'01", long 89°36'55" referenced to North American Datum of 1983, in NW 1/4 NE 1/4 NE 1/4 sec.31, T.27 N., R.8 E., Stephenson County, IL, Hydrologic Unit 07090003,
On the downstream side of the (IL Rt. 75) Stephenson Street Bridge, 4.6 mi upstream from Yellow Creek, and at river mile marker 61.6.
Prior to June 28, 2017, Lat 42°18'10", Long 89°37'10.0" on right bank on property of Commonwealth Edison Company in Freeport, 0.3 mi upstream from Stephenson Street Bridge, 5 mi upstream from Yellow Creek, and at mile 61.9.
DRAINAGE AREA - 1,326.88 mi².
REVISIONS HISTORY -
WSP 1175: 1944, 1948. WSP 1508: 1915(M), 1917(M), 1921(M), 1924(M), 1928(M), 1930(M), 1935-37. WDR IL-72-1: Drainage area.
Revisions: Gage datum was updated to 742.41 ft NAVD88 on June 14, 2022, as determined by a GNSS Level II survey using GEOID18.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: September 1914 to current.
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1978-91 and 2009 to current.
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: September 1914 to current.
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1978-91 and 2009 to current.
GAGE - Water-stage recorder and U.S. Army Corps of Engineers satellite telemeter. Datum of gage 742.41 ft. above NAVD 88. Prior to Jan. 15, 1935, nonrecording gage at site 0.9 mi downstream at datum 4.2 ft lower. July 13, 1943 to Aug. 25, 1982, auxiliary nonrecording gage 0.9 mi downstream read once daily.
REMARKS - Accuracy of records is discussed in the annual Station Analysis archived at the USGS IL Water Science Center.
EXTREMES FOR PERIOD OF RECORD - SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 18,400 ft³/s, March 16, 1929, gage height, 19.76 ft, site and datum then in use; minimum, 82 ft³/s, December 11, 1957, result of freezeup.
