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  • Corps considers future changes that may impact Willamette Valley System operations, maintenance

    Army engineers and planners are considering major changes that may impact the continued operations and maintenance of the Willamette Valley System (WVS). U.S. Army Corps of Engineers (Corps) staff continue developing an Environmental Impact Statement (EIS) for WVS operations and maintenance in accordance with authorized project purposes, while meeting Endangered Species Act (ESA) obligations to avoid jeopardizing the continued existence of listed species.

  • That sounds fishy: fish ladders at high-head dams impractical, largely unneeded

    Humans. What other sentient being designs a tool requiring hands and feet and expects animals without limbs to use it? Alas, the answer is humans. Humans created a ladder for fish, which is quite effective in certain situations – but isn’t a blanket solution to every fish passage problem. And while most humans would agree that ladders can be useful for climbing short distances, perhaps 20-50 feet– another tool – like an elevator or truck – may be a better option to climb hundreds of feet. Otherwise, there would need to be more infrastructure to support that ladder, or perhaps it would need to be a staircase at that point. This is similar for fish when moving them up and downstream.

  • That sounds fishy: twisting traps troll tributaries in the Willamette

    The bulky contraptions float listlessly downstream of three dams in Oregon’s Willamette Valley. The buoyant, metal devices hold large screws that the water flow turns. This twist of the screw – creating a creaking, rasping, scraping sound – generates enough hydraulics to keep small fish from escaping the slowly spinning, cone-shaped collectors – or, screw traps.

  • 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.

  • Corps modifies operations to improve salmon passage at Detroit Dam

    The U.S. Army Corps of Engineers is modifying operations at Detroit Dam to improve juvenile salmon downstream passage survival by releasing water exclusively through the upper regulating outlets when downstream passage rates are high.

  • 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.

  • Historic wildfires test Corps’ Willamette Valley projects

    The wildfires that closed in on the Corps’ 13-dam system in the Willamette Valley caused minor damage at four dam sites.

  • The longest shift: dam operator trapped at Detroit Dam during wildfires

    Before leaving for his work shift, Mike Pomeroy said goodbye to his wife, Ronda, the way he always did: with a promise. “I’ll see you in 14.” The powerplant operator then made the drive for his shift at Detroit Dam that Labor Day evening, in “red flag” conditions as the Beachie Fire consumed swaths of land to the northeast.

  • Corps closes recreation areas due to Willamette Valley fires

    Due to multiple fires burning throughout the Willamette Valley, the U.S. Army Corps of Engineers, Portland District is closing all of the recreation areas it manages near its dams.