|Basin countries||United States|
Barker Reservoir is a flood control structure in Houston, Texas which prevents downstream flooding of Buffalo Bayou, the city's principal river. The reservoir operates in conjunction with Addicks Reservoir to the northeast, which impounds Mayde and Bear Creeks, two tributaries of the Buffalo. Both reservoirs were authorized under the Rivers and Harbors Act of June 20, 1938, which were modified by the Flood Control Acts of August 11, 1938; September 3, 1954; and October 27, 1965.
The Barker Reservoir spillway is located at.
The Barker Dam and Reservoir is named for Eldred Barker (1775–1842), an early pioneer from Natchitoches Parish, Louisiana, whose 1839 Headright Grant comprises 320 acres of the site which was first surveyed on September 22, 1842.
Barker Reservoir is formed by a rolled earthen dam 72,900 feet (22,200 m) long. A 12-foot-wide (3.7 m) gravel road extends along the top of the dam. The top of the dam has a maximum elevation of 112.5 feet (34.3 m) above the N.G.V.D. and is 36 feet high in places. The maximum storage capacity of the reservoir is 209,000 acre feet (258,000,000 cubic metres; 258 gigalitres), Combined with the adjacent Addicks Reservoir to the northeast, the total storage capacity is about 410,000 acre feet (510,000,000 m3; 510 GL).
From 2008 to 2014, the U.S. Army Corps of Engineers Galveston District implemented $4.4 million in interim risk reduction measures (at Addicks and Barker dams) to address deficiencies until long-term solutions could be identified and executed. In 2014, staff completed a Dam Safety Modification Study to evaluate long-term repairs and address issues associated with the dams. Staff presented this information during a public meeting October 29 at Bear Creek Community Center in Houston to discuss these plans and gather feedback. Construction is scheduled to begin May 2015 with an estimated completion date of 2019.
It is estimated the Addicks and Barker Reservoirs, along with other federal construction projects on Buffalo Bayou and its tributaries, will prevent average annual flood damages of $16,372,000 to the city of Houston.
During and after Hurricane Harvey, 7,000 acres of private upstream land was submerged by floodwaters held back and controlled by the Addicks and Barker dams.A series of lawsuits were filed in the U.S. Court of Federal Claims (CFC) after this flooding.  The CFC selected thirteen property owners to serve as tests cases in a bellwether trial to determine liability. The CFC also appointed attorneys Armistead Easterby, Daniel Charest, and Charles Irvine as Co-Lead Counsel for upstream plaintiffs. 
Federal Claims Judge Charles Lettow presided over the May 2019 liability trial, which was held in Houston, Texas. On December 17, 2019, the CFC held that the upstream flooding constituted a Fifth Amendment taking. 
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