Bonneville Dam - Hydroelectric Project Information

General Information

Bonneville Dam. Columbia River. River Mile 146.1
1938 (second powerhouse completed in 1982)
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.

Bonneville Dam image
Image Source: USACE Digital Visual Library. Image File Number: 4597-07. Photographer: Bill Johnson. Date: 6/9/98.

These web pages provide information about the location, construction date, pool elevation, and powerhouse capacity of the major federal and non-federal hydroelectric projects in the Columbia Basin. All information is courtesy of U.S. Army Corps of Engineers, NWD unless otherwise noted. The information and images are from the Army Corps of Engineers 1989 publication, "Columbia River and Tributaries Review Study: Project Data and Operating Limits" unless otherwise noted. USACE makes no warranties concerning the accuracy, reliability, or suitability of the data for any particular purpose. Pages include links to the owners/operators hydroelectric project web sites with visitor/tour information and further information. The map and these web pages cover only the major federal and non-federal dams in the region.

Photos presented on these pages of the individual hydroelectric projects have been provided by various sources. Images from USACE Digital Visual Library are Public Domain images and have been cleared for public release. The USACE provides them for your use for free. Where appropriate, please give credit to "US Army Corps of Engineers." Use of all other images should be cleared through the image provider.

Columbia Basin Research provides these web pages for informational purposes only. Columbia Basin Research is not affiliated with any hydroelectric project. Please contact the Owner/Operator for questions about operations, tours, and any other matter.