Water-Data Report 2007 03593000 Lower Basin Lower Tennessee-Beech Subbasin

LOCATION.--Lat 35°04′16″, long 88°15′04″ referenced to North American Datum of 1927, Hardin County, TN, Hydrologic Unit 06040001, at Pickwick Landing on , 1.5 mi north of town of Pickwick Dam, 6.1 mi upstream from Lick Creek, 52.7 mi downstream from , and at mile 206.7. DRAINAGE AREA.--38,820 mi², approximately. SURFACE-WATER RECORDS PERIOD OF RECORD.--October 1937 to current year. GAGE.--Water-stage recorder. Datum of gage is sea level. COOPERATION.--Records furnished by Authority. REMARKS.--Reservoir is formed by concrete dam with riprapped earth embankments. Spillway equipped with twenty-two 2-section lift gates, each 40 ft high by 40 ft wide, one of which is used as a trash gate. Dam completed and storage began Feb. 8, 1938; water in reservoir first reached minimum pool elevation Feb. 18, 1938. Revised capacity table put into use Jan. 1, 1971. Total level pool capacity at elevation 418.0 ft, top of gates, is 557,100 cfs-days, of which 210,200 cfs-days is controlled flood storage above elevation 408.0 ft, minimum navigation pool. Reservoir is used for navigation, flood control, and power. Monthend elevation and contents at 2400, for the water year are provided in the following table.

MONTHEND ELEVATION AND CONTENTS AT 2400, WATER YEAR OCTOBER 2006 T O SEPTEMBER 2007 Contents (cfs- Change in DATE Elevation (feet) days) contents (cfs-days) Sept. 30... 412.43 522,200 Oct. 31... 410.89 401,600 -120,600 Nov. 30... 411.24 408,500 +6,900 Dec. 31... 410.70 398,600 -9,900 CALENDAR YEAR -60,200 Jan. 31... 409.61 376,700 -21,900 Feb. 28... 410.19 387,900 +11,200 Mar. 31... 412.78 440,000 +52,100 Apr. 30... 413.68 459,900 +19,900 May 31... 412.73 440,700 -19,200 June 30... 413.07 446,700 +6,000 July 31... 413.32 451,300 +4,600 Aug. 31... 413.10 447,300 -4,000 Sept. 30... 412.17 427,400 -19,900 WATER YEAR -94,800

EXTREMES FOR PERIOD OF RECORD.--Maximum elevation, 419.49 ft, Mar. 30, 1944; minimum after first filling, 407.12 ft, Dec. 18, 1944. EXTREMES FOR CURRENT YEAR.--Maximum midnight contents, 584,300 cfs-days, Aug. 16; maximum elevation, 414.93 ft; Aug. 16, minimum midnight contents, 440,200 cfs-days, Dec. 11, minimum elevation, 408.24 ft, Jan. 30. Contents based on backwater profile.

U.S. Department of the Interior U.S. Geological Survey