Hoover Dam, in Blendon Township, near Westerville, Ohio, dams the Big Walnut Creek to form the Hoover Memorial Reservoir. This reservoir is a major water source for the city of Columbus, Ohio. It holds 20.8 billion US gallons (79,000,000 m) of water and has a surface area of 3,272 acres (13.24 km), or about five square miles. Construction began during 1953 due to the increased water demand of post-war Columbus. The project was completed and dedicated in 1955 and the dam officially opened in 1958. It was named for two brothers, Charles P. Hoover and Clarence B. Hoover, to honor their careers with the City of Columbus Waterworks.

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• Quantity of concrete: approximately 180,000 cubic yards (140,000 m)
• Quantity of earth fill: approximately 600,000 cubic yards (460,000 m)
• Length of spillway: 680 feet (210 m)
• Length of dam: 2,583 feet (787 m)
• Maximum height of dam: approximately 94 feet (29 m) above stream bed
• Uncontrolled spillway elevation: 890 feet (270 m) mean sea level
• Top of dam elevation: 911 feet (278 m) mean sea level

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  A view of the bridge and water flowing over the dam
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  A view of the reservoir behind the dam
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  A view of the reservoir from on top of the dam

• Kayak Hoover Dam - a semi-informative treatise on the wonders of kayaking at the Central Ohio Reservoir, complete with pictures and interactive maps leading to boat ramps.
• GoFishOhio.com - information about fishing at Hoover Reservoir
• Ohio DNR fishing map of Hoover Reservoir