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Your San Antonio Creek Watershed

DO YOU KNOW WHERE YOUR STORM DRAINS FLOW?

The San Antonio Creek watershed is a little over 23 square miles and 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. San Antonio Creek, which has a seasonal flow, forms a part of the border between Sonoma and Marin Counties.

The upper watershed is dominated by annual grassland and mixed evergreen forest, with patches of oak and bay woodland, while the lower watershed includes extensive coastal salt marsh and brackish marsh which provide valuable habitat for fish and wildlife.

The watershed lands are primarily in private agricultural ownership. Most of the tributaries flowing from the west and south (on the Marin County side) have steep gradients and incised channels. The surrounding land is used primarily for livestock grazing. The north (Sonoma County) side of the watershed has moderate slopes. It is used for livestock grazing, vineyards, and dairy production.

Special status species in the watershed include California black rail, Ridgway’s rail, Salt marsh common yellowthroat, San Pablo song sparrow, Townsend’s big-eared bat, California red-legged frog, Northwestern pond turtle, and Salt marsh harvest mouse.

There are limited records of salmonids in the San Antonio Creek watershed. Up until the mid-1900s, Steelhead trout were fairly common. Although Steelhead were seen in 2000, they are currently extinct from the watershed. An evaluation of San Francisco Bay Area watersheds for their potential for steelhead trout restoration efforts noted that potential habitat may exist in the creek from the Point Reyes-Petaluma Road crossing down to Highway 101. California roach and Threespine stickleback are still found.

Remember, storm drains connect streets to creeks. Simple changes can make a big impact. San Antonio Creek Watershed is Ours to Protect.

LEARN BEST PRACTICES FOR PROTECTING OUR CREEKS AND RIVERS HERE >

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