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Duncan Dam Reconstruction

3278 Duncan Dam 1

Duncan Dam Reconstruction
Skamania, Washington

Reconstruction of the existing 15- to 20-ft-high Duncan Dam included the removal of existing structures and embankment, construction of a new fish passage, replacing the outlet pipeline and spillway structure, and re-constructing the embankment to its original configuration. GRI provided design recommendations for the structures and embankment reconstruction, attended construction and progress meetings, developed construction specifications with the project civil engineer, and provided construction engineering services during installation of the cut-off wall and reconstruction of the embankment.

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