W912EF25BA001_Plans.pdf

These are detailed engineering plans for the Little Goose Dam Stilling Basin Sediment Removal project located on the Snake River, spanning Oregon, Washington, and Idaho. The project, solicited under contract number W912EF25BA001 by the U.S. Army Corps of Engineers Walla Walla District, involves removing sediment from the stilling basin at River Mile 70.3, with disposal planned at River Mile 57 (Joso Disposal Site). The project scope includes precise sediment removal within specific elevation ranges (between 466.5' and 481.82'), careful navigation around concrete structures, and maintaining a minimum 2' distance from concrete edges. The disposal area is located in water deeper than 40' below the minimum operating pool, with material to be deposited in an even layer, and the work is to be completed with minimal damage to existing concrete infrastructure.

The technical documentation includes multiple detailed drawings and plans, such as site location maps, stilling basin plan views, cross-sections, isometric views of existing conditions, and photographic documentation of current site conditions. Key technical specifications include precise measurement and removal boundaries, elevation references (using NAD27 and NGVD29 datums), and specific guidelines for anchoring, sediment removal, and concrete preservation. The project appears to be part of ongoing dam maintenance and river management efforts, with careful consideration for environmental and structural integrity.