USGS Water-Year Summary 2022
05467000 POPE CREEK NEAR KEITHSBURG, IL
LOCATION - Lat 41°07'44", long 90°55'09" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 SE 1/4 sec.11, T.13 N., R.5 W., Mercer County, IL, Hydrologic Unit 07080104, on right bank at downstream side of bridge on County Road 900 E, 1.8 mi. northeast of Keithsburg, and at mile 3.0.
DRAINAGE AREA - 174 mi².
REVISIONS HISTORY - WSP 1508: 1935-37(M), 1938, 1939-43(M). WDR IL-81-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1997 to current. October 1934 to September 1986. Monthly discharge
only for some periods, published in WSP 1308. Seven-month period (March to September),
water years 1987-90. October 1990 to September 1996.
STAGE: Water years 1994-1996; 1998 to current.
GAGE -
Water-stage recorder, satellite telemeter, and crest-stage gage.
Datum of gage is 524.07 ft, Fourth General Adjustment of 1912 (levels by U.S. Army Corps of Engineers). From 2005 to 2013, incorrectly published as 524.07 ft above National Geodetic Vertical Datum of 1929 (523.85 ft. NAVD 1988). From 1978 to 1991, and from 2002 to 2004, incorrectly published as 524.07 ft above National Geodetic Vertical Datum of 1929.
Prior to Aug. 1, 1975, nonrecording gage and crest-stage gage at site 1,000 ft upstream at same datum. Aug. 1, 1975, to Aug. 24, 1981, water-stage recorder at site 500 ft downstream at same datum.
Datum of gage is 523.116 ft above NAVD of 1988. (05/04/2022, GAC)
EXTREMES FOR PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 9,640 ft³/s, Apr. 19, 2013, gage height, 29.60 ft, minimum daily discharge, 0.53 ft³/s, Aug. 6, 1989.