The U.S. Army Corps of Engineers has awarded a contract for seismic mitigation work at its 1,076.6-MW Bonneville Lock and Dam, on the Columbia River in Oregon, to Wildish Standard Paving Co. of Eugene, Ore.
The work entails filling the north wall of the old navigation lock (referred to as the Ambursen section) with concrete to reduce the risk of failure under design seismic loading. (HydroWorld 1/5/10) Monoliths 20 through 25 of the old navigation lock north wall are hollow sections and will be filled with concrete to form new gravity dam sections. The work includes foundation preparation, concrete and gravel placement, control and treatment of seepage water, anchoring, and grouting.
The contract was awarded February 19, 2010, and has a value of $3,182,550.
Wildish Standard Paving is a division of Wildish and has been involved in many large infrastructure projects, including road and bridge construction.
For more dams and civil structures news and information, click here.