Review of Soils Design Construction and Performance Observations, Lookout Point Dam Oregon.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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Lookout Point Dam, on the Middle Fork of the Willamette River, is a rolled-fill earth core and gravel shell embankment with a concrete gravity spillway and nonoverflow section, and an over-all length of 3381 ft. The embankment has a maximum height of 273 ft and is 2110 ft long along the crest from the left abutment to the point of contact with the concrete section it contains about 8,000,000 cu yd of fill. The gated spillway has a net opening of 212.5 ft and a maximum discharge capacity of 268,000 cfs. The flood-control outlet works consists of four 12-ft-diam conduits located in the spillway section, with a maximum discharge capacity of 24,000 cfs with the reservoir at minimum flood-control pool. Reservoir elevations at the spillway crest and at maximum pool will create net heads of about 190 and 235 ft, respectively. This study is one of a series of similar studies of the foundation and soil mechanics features of earth dams recently constructed by the Corps of Engineers. In these studies original design data are reviewed, construction experience is summarized, and performance of the completed structures is compared with design predictions to provide information for use in the design and construction of future similar projects.
- Civil Engineering