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  • Frigid temps increase power demand while Army dams balance needs

    With frigid temperatures and near record-setting snow accumulation in some areas of the Pacific Northwest, Army dams responded by producing power to keep the lights and heat on. The U.S. Army Corps of Engineers has 21 dams in the Columbia and Willamette river basins that ramp up power production to keep the grid stable during high demands.
  • USACE monitoring Terminus Dam and Lake Kaweah

    The U.S. Army Corps of Engineers Sacramento District is closely monitoring Terminus Dam and Lake
  • Corps begins spring drawdowns in the Red River of the North basin

    The U.S. Army Corps of Engineers, St. Paul District, is beginning the process of lowering its reservoir elevations within the Red River of the North basin this week based on recent snow measurements to prepare for potential spring snowmelt.
  • 22-074 Little Goose Dam to replace 5 waterstops in the next 18 months

    STARBUCK, Wash. – The U.S. Army Corps of Engineers, Walla Walla District, awarded a task order on August 8 for five waterstop replacements at Little Goose Lock and Dam.
  • 22-070 US Army Corps of Engineers takes turbine out of service at Little Goose Lock and Dam to inspect and repair oil leak

    STARBUCK, Wash. – Maintenance staff at Little Goose Lock and Dam have confirmed an oil leak in the Main Unit #1 turbine system, some of which was released to the Snake River. The turbine is part of the hydropower generating system at the dam.
  • Gathright Dam pulse release set for September 21

    The U.S. Army Corps of Engineers Norfolk District will conduct a pulse release at Gathright Dam, near Covington, Va., on Wednesday, September 21, 2022 beginning at approximately 6 a.m.
  • Lewis and Clark Visitor Center end of season, fall operating hours

    Lewis and Clark Visitor Center hours of operation will change beginning Saturday, Sept. 17.
  • Stability Analysis of Old River Low Sill Structure

    Abstract: An updated stability analysis was performed on the Old River Low Sill Structure due to a change in the operating conditions from historic river sedimentation. Sedimentation of the Mississippi River channel since the 1973 spring flood has caused higher river stages at lower discharges. Numerical methods used included nonlinear analysis of pile group stability, seepage analyses, and limit equilibrium methods. The structure’s foundation was compromised during the 1973 flood, and emergency repairs were conducted to prevent scouring and undermining of the foundation by the flood scour. Rehabilitation included the reconstruction of a failed wing wall on the left abutment, rock and riprap fill in the forebay channel, and emergency grouting to fill the scour hole beneath the structure. An operating restriction was emplaced to limit the differential head across the structure due to flood damage. Taking these conditions into account, results from an updated analysis showed that full headwater uplift caused increased tension in the piles, while the increased body load caused increased compressive loads in the piles. Review of piezometric monitoring and the seepage analyses showed that full headwater uplift is unlikely, indicating the foundation grouting adequately sealed the scour hole beneath the structure. Analysis results exhibited lower magnitude compression and tension loads in the piles with design load cases compared to previous analyses. Recommendations from these analyses indicate that increased monitoring and additional investigation may support increasing the differential head limitation.
  • New fish ladder planned for the Mill Creek Diversion Dam

    The Mill Creek Channel is getting an update.
  • 22-062 Lower Monumental Dam closes public dam crossing to perform spillway maintenance

    Kahlotus, Wash. – Officials at Lower Monumental Lock and Dam are closing dam crossings to the public from Sept. 12 to Sept. 25 in order to perform spillway maintenance.