USGS Water-Year Summary for Site 08045000

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	Available Parameters
	00054 Reservoir storage(Max.,Min.,Mean)
	62614 Elevation, lake/res, NGVD29(Max.,Min.,Mean)
	62615 Elevation, lake/res, NAVD88(Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

08045000 Eagle Mountain Reservoir above Fort Worth, TX

LOCATION - Lat 32°52'27.3", long 97°27'39.2" referenced to North American Datum of 1927, Tarrant County, TX, Hydrologic Unit 12030101, in valve house at left end of main section of Eagle Mountain Dam on West Fork Trinity River, 11.8 mi northwest of Fort Worth and at mile 583.3.

DRAINAGE AREA - 1,970 mi².

REVISIONS HISTORY - WSP 1922: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - Feb. 1934 to current year. Prior to Oct. 1943 end of month values only. PERIOD OF RECORD, Water-Quality.-- CHEMICAL DATA: Jan. to July 1964, Aug. 2006. BIOCHEMICAL DATA: Jan. to July 1964.

GAGE - Water-stage recorder. Datum of gage is NAVD of 1988. Datum prior to Oct. 1, 2016, was NGVD of 1929 at 0.10 ft higher. Prior to Oct. 16, 1988, non-recording gages at several sites within 1.0 mi of present site at datum then in use. Satellite telemeter at station.

COOPERATION - Capacity Table No. 5, furnished by the Tarrant Regional Water District, was put into use beginning Oct. 1, 2003. A new capacity table, Table No. 6, was furnished by the Texas Water Development Board and was put into use beginning Oct. 1, 2009. Capacity Table No. 7, furnished by the Texas Water Development Board, was put into use beginning Mar. 1, 2021.

REMARKS - Some records listed in the "Period of Record" for surface water and water quality may not be available electronically. The reservoir is formed by two sections of rolled earthfill and a concrete spillway separated by high natural ground. Total length of the dam including spillway is 4,800 ft. The dam was completed Oct. 24, 1932, and storage began Feb. 24, 1934. The spillway is a 1,300-ft-wide cut through natural ground located between the two sections of earthfill that make up the dam. The original service spillway, located in the section to the right of the main dam, contains a concrete spillway with four 25-ft bays, three are equipped with vertical lift gates and the fourth is left open. In 1971, a side-channel spillway was constructed. The newest spillway is located 300 ft to the left of the original service spillway and has six 11.25 x 22-ft-wide roller lift gates. The main section of the dam contains the outlet works that consist of two concrete conduits with two 48-in diameter valves in each conduit. The dam is owned by the Tarrant Regional Water District. The reservoir is used for flood control and for part of the municipal water supply for the City of Fort Worth. Conservation pool storage is 179,880 acre-ft. Data regarding the dam are given in the following table:

                                                                                  Elevation (feet)
Top of dam............................................................          682.0
Crest of spillway.....................................................          676.0
Top of gates (new side-channel spillway)..............................          659.0
Crest of (old service) spillway.......................................          649.1
Crest of spillway (new side-channel spillway).........................          637.0
Lowest gated outlet (invert)..........................................          599.9

EXTREMES FOR PERIOD OF RECORD - Maximum contents observed, 333,500 acre-ft, Apr. 26, 1942, elevation, 659.9 ft; minimum contents observed since first appreciable storage in 1935, 57,690 acre-ft, Nov. 19, 20, 1956, elevation, 629.3 ft.