Petaluma River Watershed

Situated in southern Sonoma County, California, and a portion of northeastern Marin, the Petaluma River Watershed drains 146 sq. miles (380 km2).
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[3] The watershed is around 19 miles (31 km) very long and thirteen miles (21 km) vast with the City of Petaluma near its heart. At 2,295 toes (seven-hundred m), Sonoma Mountain is the greatest position in the watershed, and its western slopes drain to the Petaluma River by way of tributaries these as Lichau Creek, Lynch Creek, Washington Creek, and Adobe Creek. The lower 12 miles (19 km) of the Petaluma River movement by way of the Petaluma Marsh, the greatest remaining salt marsh in San Pablo Bay. The marsh covers 5,000 acres (20 km2) and is surrounded by approximately 7,000 acres (28 km2) of reclaimed wetlands.[3] In the marshes west of Lakeville, the river is joined by San Antonio Creek, at which point it gets to be the boundary among Marin County and Sonoma County. The river flows underneath Point out Route 37 at Environmentally friendly Place and enters northwest San Pablo Bay just north of Petaluma Point.

The Petaluma River Floodplain, west of Lakeville
While the river's source lies over three hundred ft (100 m) earlier mentioned sea level, it descends to 50 ft (fifteen m) inside about .four mi (600 m). The river is absolutely tidal 11 mi (eighteen km) from its mouth, indicating its slight gradient as a result of the marshes underneath Petaluma. The United States Military Corps of Engineers dredges this area to continue to keep it navigable by gravel barges and pleasure craft.

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