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  • June

    Detroit Dam Aerial View

    Corps Finds No Significant Environmental Impact Reducing Detroit Dam’s Maximum Elevation Pool

    The Portland District found no significant environmental impacts associated with reducing Detroit Dam’s Reservoir maximum pool elevation by five feet to curb the risk of a large earthquake causing the spillway gates to buckle.

  • March

    Detroit Dam, 45 miles southeast of Salem, Ore. sits across the North Santiam River. It has six spillway gates that are 42 feet wide by 31 feet tall. In 2020, as a part of Portland District's comprehensive dam safety program, staff completed an updated seismic hazard analysis for Detroit Dam to better understand the potential earthquake ground motions at the site. Corps engineers used this his hazard study to analyze the performance of the spillway gates and found the risk to be higher than we previously assessed. Structural analysis of the spillway gates has shown there is a possibility for buckling of the spillway gates' supporting arms, which could result in an uncontrolled release of water from the dam. Because Detroit Dam is located upstream of many communities including the state capital of Salem, Oregon, there is potential for devastating flooding to affect large portions of the narrow North Santiam River canyon and urban areas.

    Corps considers plan to reduce Detroit Reservoir maximum pool elevation

    Portland District, U.S. Army Corps of Engineers considers a plan to reduce Detroit Reservoir’s maximum pool elevation by five feet beginning this summer to reduce the likelihood of overstressing the spillway gates during a large earthquake, which might impact boat ramp access in some years.

  • October

    Spillway gate rehab closes Detroit Dam road

    A second season of rehabilitation of the Detroit Dam spillway gates begins Nov. 2, which will close the road on top of the dam. The U.S. Army Corps of Engineers anticipates the work window and road closure to last through February 28, 2021.

  • September

    Green Peter Dam releases water through its spillways. Green Peter Dam is located on the Middle Santiam River near Sweet Home, Oregon. The Corps operates Green Peter Dam and 12 other dams and reservoirs in the Willamette River Basin. All contribute to a water resource management system that provides flood risk management, power generation, irrigation, water quality improvement, fish and wildlife habitat and recreation on the Willamette River and many of its tributaries. Since their completion, the dams have cumulatively prevented more than $20 billion in flood damages to the Willamette Valley.

    Green Peter Dam less risky after extensive studies, rehab and assessment

    After years of extensive studies, a risk assessment and recent rehabilitation of spillway gates, officials re-classify Green Peter Dam, near Sweet Home, Ore., as a Low Risk dam. Recent rehabilitation of the spillway tainter gates for trunnion friction and overall reliability have improved the risk characterization. These efforts along with a detailed review of the dam’s hazards, performance and consequences, helped decrease risks from the last assessment, which rated Green Peter as a High Risk dam.

  • February

    Willow Creek Dam

    Corps to upgrade early warning sensors at Willow Creek Dam

    Starting in mid-February, the U.S. Army Corps of Engineers, Portland District, will install new sensors in the foundation of Willow Creek Dam, which will provide early warning if the dam’s performance changes over time.

  • October

    Corps drills into Foster Dam during geotechnical investigation

    The U.S. Army Corps of Engineers’ Dam Safety team will conduct a geotechnical investigation at Foster Dam near Sweet Home, Oregon. Drilling should begin on October 22 and it will include boring into the dam’s embankment or rock-fill portion of the dam.

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