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The Miller Creek watershed covers 12 square miles. Miller Creek flows eastward from open space and private ranches on Big Rock Ridge through multiple unincorporated housing developments, including Miller Creek Estates and Marinwood. It passes under Highway 101 and enters the baylands at the Northwest Pacific Railroad (NWPRR) Bridge. Historical ecology San Francisco Estuary Institute...

The Tomales Bay and Lagunitas watershed includes several subwatersheds: Inverness Lagunitas Creek Walker Creek East shore drainages such as Millerton Gulch, Grand Canyon, and Tomasini Canyon It is designated as a Wetland of International Significance. Flood Control Zone 10: Inverness The watershed includes Flood Control Zone 10: Inverness within it's boundaries. The Zone has an...

The Stemple Creek watershed drains 50 square miles of Sonoma and Marin counties. The Sonoma-Marin County line cuts the Stemple Creek watershed almost exactly in half. It begins west of Petaluma and empties into the Pacific Ocean through the Estero de San Antonio. Estero de San Antonio is a small coastal lagoon that's part of...

Marin’s Southern Coastal watersheds include: Webb Creek Lone Tree Creek Cold Stream Redwood Creek Alder Creek Rodeo Lagoon Tennessee Valley Webb Creek Webb Creek originates at the peaks of Mt. Tamalpais and flows towards the Pacific Ocean through Steep Ravine Canyon and Mt. Tamalpais State Park. The creek drains into the Pacific between Stinson Beach...

The San Rafael watershed covers 11 square miles. The creek starts in the hills above the Tamalpais Cemetery. From there it flows through residential and industrialized areas before forming the San Rafael Canal. The creek enters San Rafael Bay at Pickleweed Park. San Rafael Creek and Canal were once important commercial waterways in Marin. Today,...

The San Antonio Creek watershed extends from Antonio Mountain and Chileno Valley, in the northwest, to Petaluma Marsh and the Petaluma River to the southeast. It covers approximately 25% of the Petaluma River watershed. It The creek, which has a seasonal flow, forms a part of the border between Sonoma and Marin Counties.

Rush Creek, at the northern edge of Novato. It supports coastal saltwater marsh and coastal brackish-water marsh habitats, providing critical wetland habitat year-round Flood Control Zone 1: Novato The watershed includes Flood Control Zone 1: Novato within it's boundaries. The Zone has an advisory board appointed by the District Board that reviews projects and how...

The Ross Valley watershed is 28-square miles. It extends from Mt. Tamalpais and White’s Hill through the communities of Fairfax, Sleepy Hollow, San Anselmo, Ross, Kentfield, Greenbrae, Larkspur, and Corte Madera to the San Francisco Bay. Flood Control Zone 9: Ross Valley The watershed includes Flood Control Zone 9: Ross Valley within it's boundaries.  The...

The Richardson Bay watershed links together the communities of: Mill Valley Tiburon Sausalito Marin City Tamalpais Valley Belvedere Flood Zone 3 and Flood Zone 4 The watershed includes two Flood Control Zones within it's boundaries: Zone 3: Richardson Bay Zone 4: Bel Aire The Zone has an advisory board appointed by the District Board that...

About The Point Reyes National Seashore (PRNS) extends from Tomales Point at the mouth of Tomales Bay toward the town of Bolinas at Pablo Point. It includes the watersheds that drain into: Drake’s Estero Abbotts Lagoon Estero de Limantour The Pacific Ocean It also drains into portions of the Bolinas Lagoon and the Tomales Bay...

The Novato Creek Watershed is a 45-square mile basin. Its creeks flow through unincorporated Marin County and the City of Novato, and into San Pablo Bay near the mouth of the Petaluma River. It is the largest watershed in eastern Marin County. Flood Control Zone 1: Novato The watershed includes Flood Control Zone 1: Novato...

The Gallinas Creek watershed is 5.6 square mile basin on the eastern side of Marin County between the Miller Creek and San Rafael watersheds. It has two main drainage areas: North Fork South Gallinas Slough Flood Control Zones 6 and 7 The watershed includes two Flood Control Zones within its boundaries: Zone 6: San Rafael...

The Estero Americano watershed covers 49 square miles. It forms a portion of the northern boundary between Marin and Sonoma counties where it drains into Bodega Bay. The Estero Americano is a coastal estuary at the base of Americano Creek, the estuary's sole tributary. In some years, a seasonal sand bar at the mouth restricts...