Big Tujunga Reservoir Sediment Removal Project


SCH Number
Lead Agency
Los Angeles County Flood Control District
Document Title
Big Tujunga Reservoir Sediment Removal Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Big Tujunga Reservoir (BTR) and Maple Canyon Sediment Placement Site; Open Space zoning; O-NF designation

Document Description
The project involves restoring flood management and water conservation capacity by excavation up to 4.4 million cubic yards of sediment within Big Tujunga Reservoir and placing the sediment within the adjacent Maple Canyon SPS up to its capacity. Sediment removal would occur during the non-storm season via trucks or conveyor belts. Sediment removal is anticipated to take approximately five years, or more if needed. During each year of sediment removal, activities would start on or shortly after April 16 and would include: (1) installing a bypass line to divert inflow from the reservoir (upstream of the Dam) into Big Tujunga Creek; (2) dewatering the plunge pool and fish removal; (3) installing sediment filtration best management practices at the plunge pool's outfall into Big Tujunga Creek; and (4) dewatering the reservoir. Dam functions would be restored for normal operations during the storm season on October 15 of each year.

Contact Information
Eric Lim
Los Angeles County Flood Control District
PO Box 1460
Alhambra, CA 91802

Phone : (626) 458-6133


34°17'48"N 118°11'9"W
Los Angeles
Cross Streets
Big Tujunga Canyon Road / Angeles Forest Highway
Total Acres
State Highways
Big Tujunga Canyon Creek
Other Location Info
La Crescenta-Montrose, Sunland

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (Sediment Removal and placement, flood control)
Local Action
Other Action Other Action: Sediment Removal
Project Issues
Aesthetic/Visual Agricultural Land Air Quality Archaeologic-Historic Biological Resources Drainage/Absorption Flood Plain/Flooding Forest Land/Fire Hazard Geologic/Seismic Minerals Noise Population/Housing Balance Public Services Recreation/Parks Soil Erosion/Compaction/Grading Solid Waste Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Water Supply Wetland/Riparian Land Use Cumulative Effects Other Other Issues: GHGE
Reviewing Agencies
Air Resources Board, Major Industrial Projects California Department of Fish and Wildlife, South Coast Region 5 California Department of Parks and Recreation California Department of Public Health California Department of State Parks, Division of Boating and Waterways California Department of Transportation, District 7 California Highway Patrol California Native American Heritage Commission California Regional Water Quality Control Board, Los Angeles Region 4 California State Lands Commission Office of Emergency Services, California Resources Agency Resources, Recycling and Recovery State Water Resources Control Board, Division of Water Rights Department of Water Resources

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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