Lake Walter E. Long (also known as Decker Lake)^[1] is a reservoir on Decker Creek in Austin, Texas. It was officially impounded in 1967 and provides cooling water for a power plant that produces electricity from petroleum-based fuels. The dam and the lake are managed by the City of Austin. Surrounding the lake is the city's Lake Walter E. Long Metropolitan Park, a popular recreational destination.

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Lake Walter E. Long
U.S. soldiers and various state personnel conducting airborne and water rescue drills in 2012
Lake Walter E. Long Show map of Texas Lake Walter E. Long Show map of the United States
Location	Austin, Texas
Coordinates	30°17.11′N 97°35.77′W
Type	Power plant cooling reservoir
Primary inflows	Decker Creek
Primary outflows	Decker Creek
Basin countries	United States
Managing agency	City of Austin
Built	1967
Surface area	1,269 acres (514 ha)[1]
Max. depth	60 ft (18 m)
Surface elevation	555 ft (169 m)

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Lake Walter E. Long has been stocked with species of fish intended to improve the utility of the reservoir for recreational fishing. Fish present in Lake Walter E. Long include catfish, largemouth bass, hybrid striped bass, and sunfish. Plant species present in the lake water include hydrilla, pondweed, bulrush, waterstar grass, American lotus, coontail, and southern naiad.

Lake Walter E. Long Metropolitan Park is open for daytime recreational use. Boating and fishing are the most popular recreational uses of the lake.