San Pablo Bay
San Pablo Bay is a tidal estuary that forms the northern extension of San Francisco Bay in the East Bay and North Bay regions of the San Francisco Bay Area in northern California.
Most of the Bay is shallow; however, there is a deep water channel approximately in the middle of the bay, which allows access to major ports in Sacramento, , Benicia, and Martinez; and other smaller ports on the Sacramento–San Joaquin River Delta.
San Pablo Bay was named after Rancho San Pablo, a Spanish land grant given to colonial Alta California settlers in 1815, on the bay at the site of the present-day city of San Pablo. The bay is approximately 10 mi (16 km) across and has an area of approximately 90 sq mi (230 km2).
The bay receives the waters of the Sacramento and San Joaquin rivers, via Suisun Bay and the Carquinez Strait on its northeast end, and it connects to the Pacific Ocean via the San Francisco Bay on its southern end. The bay is heavily silted from the contributions of the two rivers, which themselves drain most of the Central Valley of California. San Pablo Bay also receives the waters of Sonoma Creek through the Napa Sonoma Marsh, San Rafael Creek, and the Petaluma River directly, and the Napa River which flows into the Carquinez Strait via the Mare Island Strait near its entrance into the bay. All tributaries except for Sonoma Creek are commercially navigable and maintained by the U.S. Army Corps of Engineers.
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