Whitewater River/Colorado River Aqueduct Siphon Scour and Mine Reclamation Project

5 Documents in Project


SCH Number
Lead Agency
Metropolitan Water District of Southern California
Document Title
Whitewater River/Colorado River Aqueduct Siphon Scour and Mine Reclamation Project
Document Type
NOP - Notice of Preperation

Document Description
NOTE: Revised Metropolitan is proposing 3 improvements related to its CRA. Two of the improvements would protect siphons from scour effects caused by erosion within the Whitewater River, and potentially at the WMP. The third improvement would prevent over-pressurization of the CRA in the event the San Jacinto Tunnel becomes blocked. The first improvement would include the installation of scour protection devices (i.e., a gabion wall), which would generally involve: (1) the replacement of an existing earthen berm upstream of the CRA siphon with an ~800 ft long, 12 ft wide (at the base), and 9 ft high gabion wall consisting of rock-filled cages; (2) placement of rocks to backfill a 15 ft high erosional feature directly adjacent to the downstream side of the CRA siphon's protective concrete apron; and (3) relocation of soil from the existing earthen berm to behind the newly constructed gabion wall. The second improvement would entail reclamation of the WMP, and would generally involve: (1) borrowing spoil material from the Cabazon Spoil site, created when the CRA was constructed about 70 yrs ago; (2) transporting the spoil material (and minor excess material from the Cabazon Radial Gate site) via haul truck; (3) depositing the material int eh WMP; and (4) revegetating the disturbed areas. The third improvement, at the Cabazon Radial Gate Facility, would generally involve (1) the removal of the radial gate at the San Gorgonio Wasteway; (2) the widening of ~100 ft of the existing concrete lined waste-way channel that conveys water to the San Gorgonio River; and (3) the replacement of the steel radial gate with a 125 ft long reinforced-concrete weir structure.

Contact Information
Marty Meisler, Ph. D.
Metropolitan Water District of Southern California
P.O. Box 54153
Los Angeles, CA 90054

(213) 217-6364


33°55'27"N 116°38'16"W
Desert Hot Springs
Cross Streets
I-10/Whitewater Canyon Rd, Esperanza Ave/Orange St./ Carmen Ave/Elm St
Total Acres
Parcel #
State Highways
Whitewater River, San Gorgonio River
Other Location Info
Nearest Community: Cabazon

Notice of Completion

Review Period Start
Review Period End
Development Type
Water Facilities Mining (Mine Reclamation)
Local Action
Other Action
Project Issues
Cumulative Effects Landuse Water Quality Vegetation Traffic/Circulation Soil Erosion/Compaction/Grading Public Services Noise Minerals Geologic/Seismic Flood Plain/Flooding Drainage/Absorption Biological Resources Archaeologic-Historic Air Quality Agricultural Land Aesthetic/Visual
Reviewing Agencies
Native American Heritage Commission Air Resources Board, Major Industrial Projects California Department of Parks and Recreation California Department of Public Health California Public Utilities Commission Caltrans, District 8 Colorado River Board Department of Conservation Department of Fish and Wildlife, Region 6 Department of Toxic Substances Control Office of Historic Preservation Regional Water Quality Control Board, Region 7 Resources Agency State Lands Commission State Water Resources Control Board, Division of Water Rights
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