Construction is set to begin in June on phase two of a multi-year infrastructure project that will install a pair of 2-million-gallon water storage tanks on the Mount Tamalpais Watershed.
Located near Sky Oaks and Bolinas-Fairfax roads, the Pine Mountain Tanks Project will eventually replace the Pine Mountain Tunnel, which currently stores water for Ross Valley.
The tunnel was built in 1919 and converted for water storage in 1971. The new tanks will modernize the system and be more seismically resilient.
The second phase of the project is a major milestone, Marin Water board president Matt Samson said.
“It strengthens overall system reliability; it also expands system capacity for our Ross Valley customers and provides additional water storage for firefighting — both now and for generations to come,” Samson said.
Each pre-stressed concrete tank will stand 45 feet tall and span 90 feet in diameter. The tanks will match a 560-foot-long retaining wall, built during Phase 1, and are stained brown to blend with the natural surroundings.
The $23.2 million project, funded through Marin Water’s Capital Improvement Program, is expected to continue through January 2029, with seasonal pauses.
Trail and road access near the site will be restricted during construction.
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