Hydroelectric Information for Columbia and Snake River Projects

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John Day Dam - General Information

Image Source: USACE Digital Visual Library

Dam: John Day Dam. Columbia River. River Mile 215.6

Constructed: 1971

Owner: U.S. Army Corps of Engineers, Portland District

Full Pool: 268.0 feet

Minimum Pool: 257.0 feet

Powerhouse Capacity:

Nameplate capacity: 16 @ 135 MW, 2160 MW total

Overload capacity: 16 @ 155.3 MW, 2485 MW total

Hydraulic capacity: 322 kcfs

Spillway: 1228 feet, 20 gates

• Visitor Information: see John Day Dam Tours page, USACE Portland District
• USACE Portland District for project details (includes power, navigation, fish passage and visitor information).
• USACE Hydroelectric Design Center for detailed hydroplant (pdf) information.