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  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • Corps drills into Cottage Grove Dam during geotechnical investigation

    The U.S. Army Corps of Engineers’ Dam Safety team is conducting a geotechnical investigation at Cottage Grove Dam near Eugene, Ore., beginning Thursday, which includes drilling borings in the dam embankment.

  • Corps drills into Cottage Grove Dam during geotechnical investigation

    The U.S. Army Corps of Engineers Dam Safety Team is conducting a geotechnical investigation at Cottage Grove Dam, which includes boring into the dam. Cottage Grove Dam is located on the Coast Fork of the Willamette River south of Eugene, Ore.

  • Corps continues field studies at Willamette Valley dams

    A drill crew will soon be on site at Cougar Dam, east of Eugene, Oregon, as the U.S. Army Corps of Engineers continues field investigation at some dams in the Willamette Valley. The crews will also install instrumentation on the crest of Cougar Dam. The drilling and installation will require the eastbound lane across the dam to be closed intermittently. These closures will be from May 30 to June 13 between 7 a.m. to 6 p.m., reducing traffic to one lane.

  • Corps performs field studies at Willamette Valley dams

    Construction crews are on site at Hills Creek Dam as the U.S. Army Corps of Engineers begins field investigation at some of its dams. The investigations at Hills Creek, Cougar and Lookout Point dams will give the Corps additional information to better understand conditions within the dams and in their foundations.

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