What is One Tam?
Who We Are
The open spaces on Mt. Tamalpais are a mosaic of interlocking protected areas primarily managed by four public agencies: Marin Water, National Park Service, California State Parks, and Marin County Parks.
These agencies have the honor of protecting some of the most beautiful, ecologically rich, and well-loved open spaces in the region, and an important source of drinking water for Marin County residents.
One Tam brings these four agencies together with the nonprofit Golden Gate National Parks Conservancy to leverage the skills and resources of each partner and inspired community members to support the long-term stewardship of Mt. Tamalpais.
Mt. Tamalpais State Park, one of 280 units under the California Department of Parks and Recreation, encompasses 6,300 acres of land on Mt. Tamalpais.
Lands on the northeast side and along the base of Mt. Tam fall within Marin County Parks’ network of preserves.
For three decades, the nonprofit Parks Conservancy has worked with the public agencies and community organizations on restoration projects, trails, and volunteer and youth programs in Marin County.
Marin Water, a public utility providing water to 186,000 people in Marin County, manages 18,600 acres of watershed on the northern flank of the mountain for public use.
(Golden Gate National Parks)
Portions of the west side of the mountain, including Muir Woods National Monument, are managed by the National Park Service.
What We Do
Despite our different borders, Mt. Tamalpais is an interconnected landscape. One Tam offers a coordinated approach where the mountain’s land managers work together more holistically, building on the community’s long history of conservation, stewardship, and giving.
One Tam’s science and restoration work also help us understand and protect the mountain’s long-term health. Our volunteer programs engage people of all ages in caring for this treasured place. And membership opportunities renew the spirit of philanthropy that has been so fundamental to the preservation of Mt. Tamalpais over the past century.
Learn more about our work and how you can be a part of helping care for Mt. Tamalpais:

Individuals, community organizations, and local businesses can all help support our restoration, stewardship, and education efforts. Supporting One Tam supports the mountain!

Share your time and talents with Mt. Tamalpais! One Tam supports the volunteer efforts of all of our partners and also offers a number of special opportunities to give back to the mountain that gives us all so much.

Inspiring future Mt. Tamalpais stewards and supporters is essential if we are to continue its long legacy of community care. With the mountain as a classroom, young stewards learn restoration practices, science, and leadership skills, and create meaningful experiences that will last a lifetime.

Mt. Tamalpais’ diverse wildlife, important habitats, and much-loved trails are the focus of a wide array of restoration and stewardship work. One Tam brings together the expertise and resources of its partners with additional funding and community support to care for Mt. Tamalpais in a way that none of us could do alone.

Mt. Tamalpais is an ecological treasure. But climate change, invasive species, forest diseases, and other challenges affect its plants, animals, water, and air. While we all have a role to play in helping keep this place healthy and resilient, how do we know what we need to do? Scientists and managers came together to find out: how healthy is Mt. Tamalpais?

Landscape-scale stewardship is how we work together across boundaries to care for the places we love, enjoy, and depend upon, and how we continue to renew and sustain these places for current and future generations. The One Tam partnership embodies this approach by creating a more seamless network among Mt. Tamalpais’ land managers. Learn more about how we are going further together.
