Cutoff wall installation at Herbert Hoover Dike
A worker directs a "hydro-mill" into position while installing a partial cutoff wall in the Herbert Hoover Dike. The cutoff wall was installed in 21.4 miles of the dike from 2007-2013 to help reduce seepage through the earthen dam as part of a major rehabilitation project.

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Photo by: U.S. Army Corps of Engineers Jacksonville District |  VIRIN: 100223-A-CE999-362.JPG