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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...