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May 27, 2009

Portland lecture on Dalles spillwall

A Portland presention at 11:30 a.m. on June 3 will cover how to build an 830-foot-long wall in the Columbia River without impeding hydroelectric power generation.

The Army Corps of Engineers is building the spillwall, not to block water or fish, but to deflect the spillway’s flow and guide endangered juvenile salmon to the deepest and safest part of the river downstream from The Dalles Dam. The wall must stand up to the significant forces of spill and the eroding action of water.

The design of the 10-foot-wide, 25-foot-tall wall uses 200-ton hollow precast concrete units filled with concrete and then post-tensioned with high capacity, 30- and 40-strand rock tendons.

Pat Duyck, project manager, will speak at Kells Irish Restaurant & Pub, 112 S.W. Second Ave., to the Society of American Military Engineers.

The lunch is $20 for group members, $30 for non-members or members and $10 for young/student members. Reservations are required by noon, June 1; write lgreep@water.ci.portland.or.us or call (503) 823-6900.




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