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  • 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.
  • 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.
  • Water level lowered at Black Rock Lake to allow for repairs to dam, debris cleanup

     The U.S. Army Corps of Engineers (USACE), New England District announced today that the water level
  • USACE Vicksburg District halts water release at Sardis Dam for routine inspections

    VICKSBURG, Miss. -- The U.S. Army Corps of Engineers (USACE) Vicksburg District has temporarily stopped releasing water at Sardis Lake in preparation for routine maintenance and inspection of several key flood control structures that will take place until August 31.
  • Aitch Recreation Area Artesian Well to Reopen

    Following an extensive relocation project, the Artesian Well at Aitch Recreation Area of Raystown
  • Corps to host virtual public scoping meeting on Shenango River Lake master plan revision

    The U.S. Army Corps of Engineers Pittsburgh District is hosting a virtual public meeting to kick off the Shenango River Lake master plan revision. The corps is seeking public input about environmental and recreational topics to consider while revising the master plan, which will guide the use of the lake’s natural resources for the next 25 years.
  • Men’s overconfidence leads to unnecessary drownings

    SAVANNAH, Ga. – Nearly 90 percent of drownings at U.S. Army Corps of Engineers’ lakes are adult males and it seems arrogance – thinking they can swim and lame excuses, like life jackets are uncomfortable or unflattering, lead to drownings in many cases.
  • USACE Vicksburg District temporarily closes road and area around Wallace Lake Dam

    VICKSBURG, Miss. – The U.S. Army Corps of Engineers (USACE) Vicksburg District will close road and foot traffic access to Wallace Dam starting today.
  • 22-027 Spillway gate repairs at Lower Monumental Dam closes public dam crossing until May 30

    KAHLOTUS, Wash. – Recent routine inspections at Lower Monumental Lock and Dam resulted in an important dam safety discovery, a trunnion on Spillway Gate 3 had friction levels outside of the safe operating range.

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