Mountain Tunnel Improvements Project

4 Documents in Project


SCH Number
Lead Agency
City and County of San Francisco
Document Title
Mountain Tunnel Improvements Project
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Predominantly Public
Document Description
The San Francisco Public Utilities Commission (SFPUC) is proposing the Mountain Tunnel Improvements Project (project) to improve the condition of the existing Mountain Tunnel, and to ensure the tunnel's continued ability to reliably convey water to its 2.7 million customers in the Sierra foothills and San Francisco Bay Area. The project is in the central Sierra Nevada Mountain Range near the town of Groveland in Tuolumne County. The tunnel begins at Early Intake Reservoir on the Tuolumne River and extends approximately 19 miles west to Priest Reservoir, near the town of Groveland. Conditions in the tunnel interior vary along the alignment, with unlined sections on the east and concrete-lined sections on the west. *See NOC for full details*

Contact Information

Timothy Johnston
Agency Name
City and County of San Francisco Planning Department
Contact Types
Lead/Public Agency

Agency Name
San Francisco Public Utilities Commission
Contact Types
Project Applicant


Mariposa, Tuolumne
Cross Streets
Total Acres
Parcel #
State Highways
SR 120, SR
Big Oak Flat School, A
Tuolumne River, South Fork Tuolumne River, Priest Re

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
Cal Fire, California Department of Conservation (DOC), California Department of Fish and Wildlife, Central Region 4 (CDFW), California Department of Parks and Recreation, California Highway Patrol, California Native American Heritage Commission (NAHC), California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB), Central Valley Flood Protection Board, Department of Water Resources, Office of Historic Preservation, Resources Agency, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality, California Department of Transportation, District 10 (DOT)
State Reviewing Agency Comments
California Department of Transportation, District 10 (DOT)
Development Types
Water Facilities (Type Tunnel)
Local Actions
Tunnel Repair
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Sewer Capacity, Solid Waste, Transportation, Vegetation, Wetland/Riparian, Wildfire


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 or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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