Mountain Tunnel Improvements Project


SCH Number
Lead Agency
San Francisco, City and County of (City and County of San Francisco)
Document Title
Mountain Tunnel Improvements Project
Document Type
MND - Mitigated Negative Declaration
Project Applicant
San Francisco Public Utilities Commission
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
City and County of San Francisco Planning Department
1650 Mission Street, Suite 400
San Francisco, CA 94103

Phone : (415) 575-9035


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

Review Period Start
Review Period End
Development Type
Water Facilities (Tunnel Type)
Local Action
Tunnel Repair
Project Issues
Aesthetic/Visual Agricultural Land Air Quality Archaeologic-Historic Biological Resources Drainage/Absorption Flood Plain/Flooding Forest Land/Fire Hazard Geologic/Seismic Greenhouse Gas Emissions Minerals Noise Population/Housing Balance Public Services Recreation/Parks Sewer Capacity Soil Erosion/Compaction/Grading Solid Waste Toxic/Hazardous Traffic/Circulation Vegetation Water Quality Water Supply Wetland/Riparian Growth Inducing Land Use Cumulative Effects
Reviewing Agencies
Cal Fire California Department of Parks and Recreation California Highway Patrol California Public Utilities Commission Central Valley Flood Protection Board Department of Conservation Department of Fish and Wildlife, Region 4 Department of Water Resources Native American Heritage Commission Office of Historic Preservation Regional Water Quality Control Bd., Region 5 (Sacramento) Resources Agency State Water Resources Control Board, Division of Drinking Water State Water Resources Control Board, Division of Water Quality Caltrans, District 10


Environmental Document
Mountain Tunnel PC IS PMND 071219rev   PDF 70281 K SCH Summary Form for Doc Submittal_MTIP PMND   PDF 231 K
NOC   PDF 1276 K
State Comments
2019079057_Caltrans_TOU-120-PM R40   PDF 653 K
Download CSV New Search