US Army Corps of Engineers
Portland District Website


Green Peter hydropower

Generators / total output two 98 mw

Green Peter project data

Dam length 1,500 ft 457.2 m
Height 327 ft 141.1 m
Elevation (NGVD*) 941 ft 99.7 m
Lake length 10 mi 16.1 km
Area when full 3,720 ac 1,505.4 ha
*National Geodetic Vertical Datum

Contact Us

General: 541-684-4300
Recreation: 541-942-5631

Green Peter Dam & Reservoir

Green Peter Dam and Reservoir is located at river mile 5.5 on the Middle Santiam River, 11 miles northeast of Sweet Home, Ore. It is a concrete structure with a gated spillway that was completed with Foster Dam in 1968 at a cost of $82.3 million. Green Peter has two hydropower generating units capable of producing a total of 80 megawatts.

Green Peter and Foster dams work together for the purposes of flood risk management, hydropower, water quality improvement, irrigation, fish and wildlife habitat and recreation.

Green Peter recreation

Boat Ramps: Linn County Parks operates two boat ramps at Green Peter Reservoir: Thistle Creek Boat Ramp and Whitcomb Creek ParkFor more information call the Linn County Parks Department at 541-967-3917 or visit their website.

CampingLinn County Parks operates two campgrounds at Green Peter Reservoir: Whitcomb Creek Park and a group camping area - Mile Post 16, Quartzville Road, near Trout Creek. For more information call the Linn County Parks Department at 541-967-3917 or visit their website. Boat-in campsites on the banks of Green Peter Reservoir are closed except at the Upper Whitcomb Boat-in Camp Area managed by Linn County Parks.  For more information on boat-in camping, visit the Linn County Parks and Recreation website.  Roadside camping has been permanently closed. Other improvements will be implemented as funding becomes available.


Environmental stewardship at Green Peter Dam

Restoring degraded uplands, wetlands and streams on Corps lands is a main focus of the Willamette Valley Environmental Stewardship program. Recent efforts to improve wildlife habitat on Corps’ lands here centered on replacing invasive plants with native trees and shrubs, and restoration of hydrology and topography to support native plant communities and wildlife habitat.

Osprey nest along the shorelines of the lake and are annually monitored. The Corps works with the Oregon Department of Fish and Wildlife to support resident game and nongame fisheries within the waters of the Middle Santiam River basin.

Flood risk management at Green Peter Dam

Conservation season - April to November: None.
Flood season - November to March: Restrict pool to 1002 feet.

For more information, visit our Water page.