Harriman Dam +
Hydroelectric Facility 

• First online: 1923

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• Reservoir: It covers 2,184 Acres, and is 8.0-miles in length, sitting at 1,480.66 feet above sea level with 57.66 feet of managed storage. 

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• Generation type: Conventional hydropower 

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• Hydropower type: Diversion, the Harriman Dam diverts water to its generators through a 2.5-mile long, 14-foot diameter concrete-lined tunnel.

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• Output: The Harriman Station has 3 Francis turbines which output 41 megawatts of power at full capacity. 

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• Spillway: Harriman Dam features a unique style of spillway called a morning glory spillway. The spillway was one of the first of its kind and operates similarly to how a drain in a bathtub does but for the whole reservoir. The spillway is a180-foot-deep concrete funnel with a 160-foot-diameter rim (can be seen in the picture to the left). In the event of a flood, the overflow drains into the spillway at a rate of 30 million gallons per second.