PORTLAND, ORE. -- The U.S. Army Corps of Engineers is seeking comments on a draft environmental assessment of major repairs to portions of the jetties at the mouth of the Columbia River in Oregon and Washington.
The work is necessary to prevent further deterioration and structural breaches, which could alter the reliability of the jetties and impact the ability of ships to navigate the river entrance.
Actual repairs could begin as early as 2012 and would be completed in phases over 20 years.
The proposed project calls for the placement of 364,000 tons and nearly 750,000 tons of rock on the north and south jetty, respectively, along with the addition of spur groins on both jetties. Additionally, both jetties would be capped with very large armor stones to prevent further erosion of the tips. Finally, the proposal includes plans to reinforce and add groins to jetty “A” at the south end of Cape Disappointment.
The Corps expects rock would be acquired from multiple sources in Oregon, Washington, California and British Columbia. Each jetty stone would weigh between 30 and 50 tons. Rock delivery would take place by barge or truck.
The draft environmental assessment is available online at http://www.nwp.usace.army.mil/pm/e/en_plan_assess.asp
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