USGS Water-Year Summary 2023
03320000 GREEN RIVER AT LOCK 2 AT CALHOUN, KY
LOCATION - Lat 37°32'02", long 87°15'50" referenced to North American Datum of 1927, McLean County, KY, Hydrologic Unit 05110005, 870 feet upstream from Lock and Dam 2, on right bank 0.2 miles downstream from bridge on State Highway 81 at Calhoun, 0.2 miles upstream from Long Falls Creek, and at mile 63.3.
DRAINAGE AREA - 7,566 mi² of which 1,534 mi² probably is noncontributing. directly to surface runoff. Determined from 1:24,000 scale maps using FIARBC procedures.
REVISIONS HISTORY - WSP 1385: 1939. WDR KY-82-1: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - March 1930 to current year. Prior to October 1958, published as "at Livermore".
GAGE - Water-stage recorder with telemetry. Datum of gage is 353.95 feet above NGVD of 1929. Auxiliary water-stage recorder at Livermore, 8.0 miles upstream at datum 360.11 feet above NGVD of 1929. Base gages used were: Livermore gage, March 22, 1930 to September 30, 1940 (nonrecording prior to September 1, 1939), and October 1, 1942 to September 30, 1947; water-stage recorder at State Highway 81 bridge, 0.2 mile upstream from present base gage, October 1, 1940 to September 30, 1942, and October 1, 1947 to September 30, 1958, at datum 1.35 feet higher than present base gage. Auxiliary gages were: Lock 2 upper nonrecording gage, October 1, 1932 to September 30, 1939, at datum 1.35 feet higher than present base gage; recorder at State Highway 81, October 1, 1939 to September 30, 1940, and October 1, 1942 to September 30, 1947; and Livermore gage, October 1, 1941 to September 30, 1942 and after September 30, 1947. No auxiliary used prior to October 1, 1932 and October 1, 1940 to September 30, 1941.
COOPERATION - U.S. Army Corps of Engineers, Louisville District.
