USGS Water-Year Summary 2021
05512500 BAY CREEK AT PITTSFIELD, IL
LOCATION - Lat 39°37'15.09", long 90°46'50.4" referenced to North American Datum of 1983, in NE 1/4 SW 1/4 sec.18, T.5 S., R.3 W., Pike County, IL, Hydrologic Unit 07110004, on right bank at downstream side of bridge on abandoned county road, 50 ft downstream from Panther Creek, 0.1 mi downstream from U.S. Highway 54, 1.4 mi northeast of Pittsfield, and at mile 33.6.
DRAINAGE AREA - 39.4 mi².
- WSP 1175: 1940(P), 1941, 1949. WSP 1508: 1942. WDR IL-75-1: Drainage area.
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1939 to current.
STAGE: Water years 1994 to current.
GAGE - Water-stage recorder, satellite telemeter, and crest-stage gage. Datum of gage is 638.48 ft above NGVD of 1929 (levels by U.S. Army Corps of Engineers) (638.19 ft NAVD 1988). Prior to Dec. 7, 1939, nonrecording gage at same site and datum.
EXTREMES OUTSIDE PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE: Flood of Sept. 8, 1926, reached a stage of 18.4 ft, from floodmark, discharge not determined.
EXTREMES FOR PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 13,700 ft³/s, Sept. 14, 1993, gage height, 14.92 ft, from rating curve extended above 4,400 ft³/s, on basis of contracted-opening measurement of peak flow; no flow in most years.