A distorted scale (1:100 V, 1:300 H) movable-bed hydraulic model was used to evaluate 5 separate channel improvement designs in the Columbia River navigation channel between River Mile's 53 to 65. Descriptions of the tests and data relative to resulting channel scour and fill conditions are presented in the report.

A distorted scale (1:100 V, 1:300 H) movable-bed hydraulic model was used to evaluate 20 separate channel improvement designs in the Columbia River navigation channel between River Miles 64 to 78. Descriptions of the tests and data relative to resulting channel scour and fill conditions are presented in the report.