U.S. Bureau of Reclamation (Reclamation) - Moabi Backwater Maintenance Inlet Culvert Replacement Project (WDID: 7B363038001)

U.S. Bureau of Reclamation (Reclamation) - Moabi Backwater Maintenance Inlet Culvert Replacement Project (WDID: 7B363038001)

Replacement of culverts would entail removing a portion of the existing culvert crossing (paved) road. Old rock and fill material will be removed (approx. 1,935 cubic yards), this will allow for the old culvert pipes to be removed. Material removed from the existing culvert crossing will be temporarily placed adjacent to the worksite (upland site) along the levee road. This same material will be used as backfill to reconstruct the culvert road crossing once the new HDPE pipes are placed. New culverts would be set deeper, and repositioned at a downstream angle to reduce sediment accumulation around the structure and in the backwater. The goal would be to have water circulation within the backwater during all river flow regimes. Gates (which are optional) could also be placed on the river side of the culverts in order to protect the backwater in the event of a hazmat spill on the main stem of the Colorado River. To facilitate culver placement activities, a small portion of the old rock and fill structure will be left in place on the riverside. This small section of the structure that will be left in place will act as a retaining wall. This retaining wall will allow the initial placement of the culvert pipes by preventing flows from entering the work area. Culvert pipes are normally placed in sections. Once the first culvert pipe section is placed on the backwater side, the retaining wall will then be removed and the second pipe section would be placed on the river side.

Needles

San Bernardino