Big Tujunga Reservoir Restoration Project

Summary

SCH Number
2021090475
Lead Agency
Los Angeles County Flood Control District
Document Title
Big Tujunga Reservoir Restoration Project
Document Type
MND - Mitigated Negative Declaration
Received
Present Land Use
Big Tujunga Reservoir and Maple Canyon Sediment Placement Site
Document Description
The proposed Project involves the removal of sediment from the Big Tujunga Reservoir (BTR) and placement of the sediment in the adjacent Maple Canyon Sediment Placement Site (SPS), which is located approximately 1.9 miles (when traveling via existing access roads) from BTR to the upper reach of Maple Canyon SPS. Maple Canyon SPS can accommodate approximately 4.4 million cubic yards (mcy) of additional sediment, which would bring the SPS to its ultimate planned sediment capacity. The Project involves the use of trucks and equipment to remove sediment and restore capacity to the BTR, and to allow it to adequately perform its main functions of flood control and water conservation. The following minor activities would occur in conjunction with the proposed sediment removal: (1) hydroblasting to flush a stilling well on the dam crest; (2) repairing the hydraulic sluicegate; (3) paving the unpaved sections of the north access road and repairing the culvert crossing; (4) incorporating slope protection measures adjacent to the spillway; (5) rehabilitating the northern reservoir access ramp to safely access the Reservoir bottom; (6) installing a boat dock at the dam face; and (7) performing minor coring on existing dam riser and installing a slide gate to facilitate dewatering.

Contact Information

Name
Alex Ho
Agency Name
Los Angeles County Flood Control District
Contact Types
Lead/Public Agency

Name
Alia Hokuki, AICP
Agency Name
Psomas
Contact Types
Consulting Firm

Location

Counties
Los Angeles
Regions
Unincorporated
Cross Streets
Big Tujunga Canyon Road/Angeles Forest Highway
Zip
91501
Total Acres
74
State Highways
SR-2
Waterways
Big Tujunga Canyon Creek
Township
2N
Range
13W
Section
1, 6

Notice of Completion

Review Period Start
Review Period End
Development Types
Other (Sediment Removal)
Local Actions
Sediment Removal
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire
Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Los Angeles Region 4 (RWQCB), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Rights, California Department of Transportation, District 7 (DOT)
Reviewing Agency Comments
California Department of Transportation, District 7 (DOT)

Attachments

Notice of Completion [NOC] Transmittal form
State Comment Letters [Comments from state reviewing agencies]

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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