LOCATION.-- Lat 37°21'28", long 88°28'57" (NAD of 1927), Pope County, Hydrologic Unit 05140203, on right bank at lock and dam 51 at Golconda, 0.5 mi (0.8 km) upstream from McGilligan Creek, 0.7 mi (1.1 km) downstream from Lusk Creek, and at mile 903.1 (1,453.1 km).

DRAINAGE AREA.-- 143,900 mi² (372,700 km2), approximately.

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: October 1937 to September 1980 (fragmentary), (no low-flow records prior to October 1940 and after September 1952). Monthly discharge only for some periods, published in WSP 1725.

STAGE: Gage-height records collected at same site since 1924 are contained in reports of National Weather Service.

GAGE.-- Nonrecording gage. Datum of gage is 294.6 ft (89.79 m) Ohio River datum. Auxiliary nonrecording gage at lock and dam 50, 26.3 mi (42.3 km) upstream.

REMARKS.-- Discharge not computed when navigation dam 51 is partly or entirely in raised position.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,010,000 ft³/s (28,600 m³/s) Mar. 14-16, 1945; maximum gage height, 53.2 ft (16.22 m) Mar. 14, 15, 1945; minimum discharge not determined.

EXTREMES OUTSIDE PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Flood of Feb. 1-3, 1937, reached a stage of 62.6 ft (19.08 m); maximum discharge, 1,470,000 ft³/s (41,600 m³/s) Feb. 2, 3, 1937.