Inside Job

by Lois Loesch, P.E., (M.ASCE), Supervising Civ. Engr.; Raytheon Infrastructure, Inc., Bellevue, WA,
Steve Samuelson, P.E., (M.ASCE), Staff Engr.; Raytheon Infrastructure, Inc., Bellevue, WA,

Serial Information: Civil Engineering—ASCE, 2000, Vol. 70, Issue 5, Pg. 38-41

Document Type: Feature article


River Mill Dam is a large Ambursen (buttress type) dam constructed in 1911 on the Clackamas River in Oregon. The preliminary and final design phase of the seismic upgrade project coincided with significant changes in the design criteria. Strengthening the spillway structure will consist of constructing reinforced concrete diaphragm walls and struts running parallel to the dam axis between the buttresses to eliminate the out-of-plane bending problem, shear plates across cracked lift joints, anchors drilled through the downstream slabs into the buttresses, and post-tensioned anchors to solve the corbel shear problem. The rehabilitation for the powerhouse dam will consist of partial mass concrete infill.

Subject Headings: Concrete dams | Seismic design | Structural strength | Shear walls | Shear strength | Rivers and streams | Reinforced concrete

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