County Begins Interim Sediment Removal

August 17, 2011 - The County of Los Angeles has begun the interim sediment removal project at Devil's Gate Dam in Hahamongna. The initial project, which will continue through October, will undertake measures designed to reduce the flood threat while an Environmental Impact Report is being compiled for the much larger effort the County is now planning. This phase will deal with 1.5% of the amount that the County would like to remove from the Hahamongna basin.

Don Bremner has provided these pictures of the work.

Click on the photos to view a larger image.

Sediment removal

Immediately above the dam a dozer is loading a truck to move up to 25,000 cubic yards away from the dam valves.

Sediment removal 3

Looking from Devil's Gate Dam, the truck is moving the sediment to a temporary drying mound.

Sediment removal

This is the scene from the east side of Devil's Gate Dam looking northwest. The dozer is compacting the sediment into a mound for drying. Most of the material will then be moved to the former Johnson Field for temporary storage, while organic material such as tree branches will be trucked out of the basin.