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Mark Ensign
![The O'Shaughnessy Dam is located on the Scioto River near Dublin, Ohio, United States. The dam forms O'Shaughnessy Reservoir, which is a major source of drinking water for the city of Columbus. It was completed in 1925 following recommendations of then superintendent Jerry O'Shaughnessy (for whom the dam was named).[2] At the time, the reservoir was described as "the finest inland waterway in the United States." Located 10 miles upstream of the smaller Griggs Dam, it provides a large area for various forms of recreation in addition to its water supply duties. The reservoir holds 6.3 billion gallons (24 million cubic meters) over a surface area of 845 acres (342 hectares).[3] The Columbus Zoo and Aquarium is located on the east bank of the reservoir, near the dam.
In 1990, the dam was listed on the National Register of Historic Places.[1]](http://pcdn.500px.net/1140758/469f3d46d61ec8ba84029e01359cc1ab3a5c7395/4.jpg)
