MMWD's Mt. Tamalpais Watershed lands are open to the public as of January 14, 2017

ALERT: Road & Trail Closures

  • Bolinas-Fairfax Road (between Azalea Hill and Highway One) – Marin County Department of Public Works has closed this road.
  • Bon Tempe Dam Road – Closed. Bon Tempe remains open for fishing.
  • Concrete Pipe Road (between 5-corner & Bolinas-Fairfax Road) – Closed due to two major slides.
  • Lower Eldridge Grade (between Filter Plant Road and Lakeview Road) – Closed. It will remain closed until repaired. Repairs may take a couple months.
  • Shafter Grade Road – Impacted by a large slide. Bikers, hikers and horses may proceed with caution.
  • Sky Oaks Road – Open.
  • Upper Peters Dam Road (between the dam and intersection with Continental Cove) – Closed due to a large fallen fir tree that has taken down PG&E and AT&T lines.
  • Other Road and Trail Storm Damage – Many other roads and trails on the watershed have suffered storm damage such as slides and downed trees. Please stay alert and use caution. Notable routes include San Geronimo Ridge Road, Deer Park Road, Old Railroad Grade and East Portal, Pine Mountain Tunnel Road, Shadyside Trail, and Fish Grade Trail.
For questions, email water@marinwater.org. We are available during normal business hours, Monday-Friday 8 a.m. to 5 p.m.

Click here to report watershed issues.

Click here to download a watershed map.

How We Manage Our Watershed Lands

The Mt. Tamalpais Watershed is one of Marin's most valuable natural resources as it is the major source of domestic water for our customers. We believe that the best way to assure high water quality is to keep the lands in a natural condition, which means limiting use by people to activities that have the least impact on the watershed. Within certain constraints, permitted activities include hiking, biking, horseback riding, fishing, and picnicking. Camping, swimming, and boating are prohibited.

Caring for nature, managing visitors, and involving the public in watershed stewardship are the central tasks of our rangers, natural resource specialists, and watershed maintenance staff. Their responsibilities include protecting resources, managing fire risks, assisting visitors, monitoring plants and animal populations, restoring natural habitats, and maintaining access roads and trails. 

One Mountain, One Vision

MMWD is proud to be a partner of the Tamalpais Lands Collaborative (TLC), a multi-agency approach to the stewardship of Mt. Tam. Learn more about TLC and its One Tam initiative.

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