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QUADRANGLE: Griggsville, 7.5' series

LOCATION: Lat 39 42'10", long 90 38'40", in the SE 1/4 NW 1/4 sec. 34, T.15 N., R.14, W., Scott County, Hydrologic Unit 07130011, on Norfolk Southern Railroad bridge, at Flints Creek, 0.4 mile east of Valley City, 1.8 miles downstream from Mauvaise Terre Creek, 10 miles downstream from gage at Meredosia, and at mile 61.4.

ESTABLISHMENT: October 1938. Recorder installed Nov. 11, 1938. Bubble gage installed Sept. 15, 1960. ADR recorder replaced by Campbell Scientific electronic datalogger (CR-10) Oct. 19, 1988. The acoustical velocity meter (AVM) installed Feb. 23, 1989. A VM discontinued Nov. 24, 1992.

GAGE: Campbell Scientific electronic datalogger (CR-10) with a temperature thermocouple and a stage potentiometer operated by a servo manometer in a 5' 10" by 4' 8" corrugated metal house. AC power is available to run the equipment, heater. Data from the Cr-10 is stored in a storage module. Reference gage is Type-A wire-weight installed on steel handrail at pier at recorder shelter. U.S.A.E. staff gage also at same location. Elevation, gage datum, of orifice is -2.0 ft., house floor 29.5 ft., and instrum ent shelf about 33.0 ft. Also, U.S. Army Corps. of Engineers Sutron Data Collection Platform (DCP) is operated by the manometer. Operation and maintainence of the DCP is the responsibility of the Rock Island Corps. A sediment sampling box with a U.S. D-74 sediment sampler located on the upstream side of center span of bridge was removed effective Mar. 1, 1994. Sediment sampling box relocated to Illinois River at Florence bridge.

GAGE DATUM: Datum of gage is 418.00 ft. above NGVD, datum of 1929.

HISTORY: The U.S. Army Corps of Engineers have maintained a staff gage at this site for a long period, the exact beginning of which is not known. Also, not known is which Corps district owns and maintains this staff gage. This staff gage was used unti l the installation of the recorder on Nov. 11, 1938. Prior to Oct. 1, 1960, gages were located 1/4 mile upstream at site of old Wabash Railroad bridge. From Aug. 1988 to Feb. 23 1989 there was two different acoustcal velocity meters in the gage both o f which provided unsatisfactory velocity record.

FLOODS: Maximum stage known, 27.00 ft. (8 a.m. to 12 p.m.), May 26, 1943. Flood of July 27, 1993 reached a stage of 25.95 ft., caused by backwater from the flooding on the Mississippi River. Flood Stage occurs at a stage of 14.0 feet.