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Water-Year Summary for Site 07190000

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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Available Parameters
00054 Reservoir storage(Obs.)  

Water year 2020: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2020
LOCATION - Lat 36°28'07", long 95°02'28" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.14, T.23 N., R.21 E., Mayes County, OK, Hydrologic Unit 11070206, on upstream side of pier near right end of Pensacola Dam on Neosho River at Langley, 9.9 mi upstream from Big Cabin Creek, and at mile 77.0.
DRAINAGE AREA - 10,345 mi². From automated delineation using 10-meter National Elevation Dataset digital elevation model data dated 10/01/2006 and Watershed Boundary Dataset dated 10/01/2006, using Albers Equal-Area Projection, North American Datum 1983.
REVISIONS HISTORY - WDR 2012: Drainage area.
PERIOD OF RECORD - March 1940 to current year. Prior to October 1940, published as Grand Lake at Langley. Monthly contents only for 1941-42 water year
GAGE - Water-stage recorder. U.S. Army Corps of Engineers' satellite telemeter at station. Datum of gage is 1.10 ft above NGVD of 1929 (U.S. Army Corps of Engineers' benchmark). Prior to Nov. 14, 1941, nonrecording gage at same site and datum.

10/01/2013 to 09/30/2014 record rated good.

10/01/2014 to 09/30/2015 record rated good.

10/01/2015 to 09/30/2016 record rated good.

10/01/2016 to 09/30/2017 record rated good. 

10/01/2017 to 09/30/2018 record rated good, except for the periods of 01/09/2018 to 03/08/2018 rated fair and 07/19/2018 to 09/30/2018 rated poor. 

10/01/2018 to 09/30/2019 record rated fair, except for the period of 10/01/2018 to 10/11/2018 which was rated poor. 

10/01/2019 to 09/30/2020 record rated fair, except for the period of 05/13/2020 to 09/30/2020 which was rated poor. 

Reservoir is formed by multiple-arch concrete dam, with tops of taintor-type spillway gates at gage height 755.0 ft. Storage began Mar. 21, 1940; power-pool was first filled Apr. 19, 1941. Capacity between gage heights 682.0 ft, sill of powerhouse penstock, and 745.0 ft, maximum power pool is 1,492,000 acre-ft. Capacity between gage heights 745.0 ft and 755.0 ft is 525,200 acre-ft, and is reserved for flood control. Dead storage below gage height 682.0 ft is 180,200 acre-ft. Figures given herein represent total contents.

EXTREMES FOR PERIOD OF RECORD - Maximum contents, 2,213,000 acre-ft, May 25, 1957, gage height, 755.27 ft; minimum since power-pool was first filled, 642,900 acre-ft, Sept. 28, 1954, gage height, 713.41 ft.