Tetra Tech INCA performed preliminary and final design for the fixed and floating upstream guide wall for the new lock structure at Bonneville Dam on the Columbia River. This 830-foot long barrier guides barges and other traffic into and out of the new navigation lock. It consists of five separate post-tensioned concrete pontoon structures. Four of these pontoons span between the 52-foot diameter sheet pile cell support structures (span distance varies between 80 and 130 feet). The pontoons are 13-feet high by 33-feet wide concrete box girder type structures with a structural steel face along the navigation channel to resist large impact loads. The floating structure is a 400-foot long, 26-foot deep by 48-foot wide pontoon, with a composite steel impact face.

INCA provided construction services for the pontoon construction and installation, including shop drawing reviews, graving site visits, and approval of pontoon fabrication, float-out, and transport procedures.

 Bonneville Lock Fixed and Floating Guide Wall (175.38 kB)

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