Situated in southern Sonoma County, California, and a part of northeastern Marin, the Petaluma River Watershed drains 146 sq.
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miles (380 km2).[3] The watershed is somewhere around 19 miles (31 km) extended and 13 miles (21 km) extensive with the Metropolis of Petaluma in close proximity to its heart. At 2,295 feet (700 m), Sonoma Mountain is the best level in the watershed, and its western slopes drain to the Petaluma River by way of tributaries this kind of as Lichau Creek, Lynch Creek, Washington Creek, and Adobe Creek. The decreased twelve miles (19 km) of the Petaluma River move by way of the Petaluma Marsh, the premier remaining salt marsh in San Pablo Bay. The marsh covers 5,000 acres (twenty km2) and is surrounded by roughly seven,000 acres (28 km2) of reclaimed wetlands.[3] In the marshes west of Lakeville, the river is joined by San Antonio Creek, at which position it results in being the boundary in between Marin County and Sonoma County. The river flows less than State Route 37 at Green Place and enters northwest San Pablo Bay just north of Petaluma Place.

The Petaluma River Floodplain, west of Lakeville
Though the river's resource lies in excess of three hundred ft (one hundred m) over sea level, it descends to fifty ft (15 m) within just about .4 mi (600 m). The river is entirely tidal 11 mi (eighteen km) from its mouth, indicating its slight gradient by way of the marshes underneath Petaluma. The United States Military Corps of Engineers dredges this segment to hold it navigable by gravel barges and enjoyment craft.