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USGS Water-Year Summary 2024
03612000 CACHE RIVER AT FORMAN, IL
LOCATION - Lat 37°20'06", long 88°55'31" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 sec.6, T.14 S., R.3 E., Johnson County, IL, Hydrologic Unit 05140206,
DRAINAGE AREA - 244 mi².
REVISIONS HISTORY - WSP 623: 1923-24. WSP 823: 1934-35. WSP 1205: 1923-24, 1927-30. WSP 1335: 1923(M), 1925, 1926-27(M), 1928, 1929-30(M), 1931, 1933, 1934-36(M), 1937-39. WDR IL-75-1: Drainage area.
Revisions: A shift was incorrectly applied that affected the discharge from Sept. 4 through Sept. 6, 2022. The incorrect shift was adjusted and appropriately applied.
Revisions: Gage datum was updated to 307.74 ft NAVD88 on June 14, 2022, as determined by a GNSS Level II survey. Gage datum was previously published as 308.47 ft NGVD29 (308.36 ft NAVD 1988).
Revisions: A shift was incorrectly applied that affected the discharge from Sept. 4 through Sept. 6, 2022. The incorrect shift was adjusted and appropriately applied.
Revisions: Gage datum was updated to 307.74 ft NAVD88 on June 14, 2022, as determined by a GNSS Level II survey. Gage datum was previously published as 308.47 ft NGVD29 (308.36 ft NAVD 1988).
SURFACE-WATER RECORDS
PERIOD OF RECORD -
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1922 to July 1924, September 1924 to current.
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1978-91.
SURFACE-WATER DISCHARGE AND STAGE
DISCHARGE: October 1922 to July 1924, September 1924 to current.
STAGE: Water years 1994 to current.
SURFACE-WATER QUALITY
CHEMICAL: Water years 1978-91.
GAGE - Water-stage recorder, satellite telemeter, and crest-stage gage. Datum of gage is 307.74 ft above NAVD 1988. Dec. 30, 1971 to Sept. 30, 1997, recording gage at same site at datum 10.0 ft. higher. Oct. 1, 1958, to Dec. 30, 1971, nonrecording gage at same site and datum 10.0 ft. higher. See WSP 1705 or 1725 for history of changes prior to Sept. 30, 1958.
REMARKS - Flow of lower part of Cache River Basin was diverted from Ohio River to Mississippi River beginning Oct. 31, 1950, through diversion channel of Mounds-Mound City flood-protection project. Flow of upper part of Cache River Basin, including flow past this station, continued to discharge to Ohio River, passing through Post Creek cutoff directly to Ohio River instead of through the original channel of Cache River.
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, 20,400 ft³/s, estimated, affected by backwater from the Ohio River, March 20, 2008, gage height, 39.01 ft; maximum gage height, 42.29 ft, March 12, 1935, discharge, 9,630 ft³/s, site then in use, from graph based on gage readings; no flow at times in most years.
