LOCATION.-- Lat 42°05'50", long 90°07'38" (NAD of 1927), in SE1/4SW1/4 sec.2, T.24 N., R.3 E., Carroll County, Hydrologic Unit 07060005, on right bank, 60 ft downstream of U.S. Highway 52 and 64 bridge at Savanna, 4.5 mi downstream from Camp Creek, and at mile 7.8.

DRAINAGE AREA.-- 273 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1994 to September 1997.

STAGE: Water years 1995-1997.

PARTIAL RECORD: Occasional discharge measurements, water years 1978-90.

SURFACE-WATER QUALITY

CHEMICAL: Water years 1978-1990

SEDIMENT: October 1994 to September 1997

MISCELLANEOUS: Sediment concentration and particle size, water years 1996-97.

GAGE.-- Water-stage recorder. Datum of gage is 580.86 ft above NGVD of 1929. Oct. 1, 1977-Sept. 30, 1990, nonrecording gage at same site and datum.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 5,980 ft³/s Feb. 21, 1997, gage height, 19.91 ft; Minimum discharge, 36 ft³/s Nov. 14, 1996.

SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily, 2,560 mg/L, May 28, 1996; minimum daily, 6 mg/L, Sept. 29, 30, 1997.

SUSPENDED-SEDIMENT LOADS: Maximum daily, 16,700 tons, Feb. 21, 1997; minimum daily, 1.0 tons, Sept. 30, 1997.