General Information

Dam:

Bonneville Dam. Columbia River. River Mile 146.1

Constructed:

1938 (second powerhouse completed in 1982)

Owner:

U.S. Army Corps of Engineers, Portland District

Full Forebay:

77.0 feet

Normal Forebay:

71.5 - 76.5 feet

First Powerhouse Capacity:

Nameplate capacity: 2 @ 43 MW, 8 @ 54 MW, 518 MW total

Overload capacity: 2 @ 47 MW, 8 @ 60 MW, 574 MW total

Station service units: 1 @ 4 MW, 4 MW total

Hydraulic capacity: 136 kcfs

Second Powerhouse Capacity:

Nameplate capacity: 8 @ 66.5 MW, 532 MW total

Overload capacity: 8 @ 76.5 MW, 612 MW total

Fishway units capacity: 2 @ 13.1 MW, 26.2 MW total

Hydraulic capacity: 152 kcfs

Spillway ¹:

1450 feet, 18 gates

¹ Information provided by USACE Portland District via phone, 1/6/1997.

Additional Information

Bonneville Dam web page. Contact U.S. Army Corps of Engineers, Portland District for all additional information.