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USGS Water-Year Summary 2024
05419000 APPLE RIVER NEAR HANOVER, IL
LOCATION - Lat 42°15'30", long 90°17'06" referenced to North American Datum of 1983, in SW 1/4 NW 1/4 SE 1/4 sec.9, T.26 N., R.2 E., Jo Daviess County, IL, Hydrologic Unit 07060005, on right upstream corner of bridge abutment at Route 84 bridge in Hanover., and at mile 14.5.
DRAINAGE AREA - 246 mi².
REVISIONS HISTORY - WSP 1005: 1939, 1941(M). WSP 1308: 1935-38(M), 1943-45(M). WDR IL-75-1: Drainage area.
Revisions: Gage datum was revised to 606.82 ft NAVD88 on May 24, 2023, as determined by a GNSS Level II survey. Gage datum was previously published in error as 606.61 ft NAVD88.
Revisions: Gage datum was revised to 606.82 ft NAVD88 on May 24, 2023, as determined by a GNSS Level II survey. Gage datum was previously published in error as 606.61 ft NAVD88.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1934 to current. Monthly discharge only for some periods,
published in WSP 1308.
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
SEDIMENT: October 1994 to September 1997.
MISCELLANEOUS: Sediment concentration and particle size, water year 1997.
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1934 to current. Monthly discharge only for some periods,
published in WSP 1308.
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
SEDIMENT: October 1994 to September 1997.
MISCELLANEOUS: Sediment concentration and particle size, water year 1997.
GAGE - Water-stage recorder and satellite telemeter. Datum of gage is 606.82 ft. above NAVD 1988. From October 1, 1945, to April 24, 2015, the datum was 591.00 ft above NGVD of 1929 at site 0.6 miles downstream. Jan. 10, 1938, to Oct. 1, 1945, nonrecording gage at site 4.1 mi downstream at datum 9.48 ft lower. Oct. 1934 to Jan. 10, 1938, nonrecording gage at site 4.1 mi downstream at datum 9.99 ft lower.
REMARKS - Occasional low-flow regulation from dam at Hanover.
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, 21,200 ft³/s, July 22, 2017, gage height, 15.38 ft.; no flow for part of each day, May 23, 24, 1967, result of temporary closure of gate at Hanover dam. Site and datum then in use.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 3,790 mg/L, May 28, 1996; minimum daily, 5 mg/L, Aug. 5, 1997.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 28,900 tons, May 28, 1996; minimum daily, 0.8 tons, Aug. 5, 1997.
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 3,790 mg/L, May 28, 1996; minimum daily, 5 mg/L, Aug. 5, 1997.
SUSPENDED-SEDIMENT LOADS: Maximum daily, 28,900 tons, May 28, 1996; minimum daily, 0.8 tons, Aug. 5, 1997.
