| Country | United States |
|---|---|
| State | California |
| County | Sonoma |
| Coordinates | 38°15′59″N 122°47′32″W |
| Elevation | 82 ft |
| Time zone | Pacific (UTC−8) |
| Time zone (DST) | PDT (UTC−7) |
| ZIP code | 94952 |
| Area code | 707 |
| FIPS code | 06-81108 |
Two Rock is an unincorporated community in Sonoma County, California, United States. It is located on Stemple Creek in a rural area west of Petaluma. A hill named Dos Piedras (Spanish for "two rocks", 157 feet (48 m) above sea level) overlooks the community from the north. The community is named for the two rocks, a landmark for the ancient Native American trail to the Sierras shared by the Washoe, Pomo, and Coast Miwok tribes.[1] Two Rock had a fire department[2], a post office located at the intersection of Bloomfield and Tomales Road, as well as a school 1.3 miles west of the former post office, on Tomales Road. A new school has since been built further east, but the original school building still stands.[3][4] The principal of Two Rock Union School from 1963-1978, Helen Putnam, became mayor of Petaluma, California in 1965.[5]
The main road is Valley Ford Road, which passes northwest–southeast through Two Rock. The Coast Guard's Training Center Petaluma is located just south of Two Rock. Two Rock used to provide basic services to local ranches, but little remains today.[6]
The Mexican Empire under General Vallejo established the Dos Piedras settlement as a military outpost making Americano Creek the bulwark to Russia's Fort Ross, Russian River, Sebastopol and Bodega Bay claims in Northern California .[7]
Dos Piedras marked the corners of the Blucher and Balsa de Tomales ranchos. The trail from San Rafael to Bodega and Ross passed between the two rocks. Early Sonoma County historian Robert A. Thompson said, "It was the custom among the Indians in the back country to take two or three journeys each year [along the path] to the coast for the purpose of feasting on shell-fish, and gathering shells for the manufacture of Indian money."[8]
References
- ^ Paull, Margaret (2011). The Valley of the Trail Between the Two Rocks. 2nd ed. ISBN 978-1257823253.
- ^ "A Brief History of Two Rock Valley". Internet Archive. Two Rock Volunteer Fire Department. Retrieved 5 February 2026.
- ^ Thompson, R. A. (1877). Historical atlas map of Sonoma County, California. Fresno, Calif.: Mid-Cal Publishers. Archived 2013-08-08 at the Wayback Machine. Retrieved 2024-07-13.
- ^ United States Department of the Interior, Geological Survey (1954). Two Rock Quadrangle, California. United States Geological Survey.
- ^ "Helen Putnam & the Supreme Court". Petaluma Historian. Retrieved 5 February 2026.
- ^ "Marin County Watershed Management Plan Administrative Draft". Retrieved 2008-03-03.
- ^ "History of Two Rock Valley". USCG TranCen Petaluma. United States Coast Guard. Retrieved 5 February 2026.
- ^ Robert, Thompson (1877). Historical and descriptive sketch of Sonoma County, California. L.H. Everts & Co. pp. 101–102. Retrieved 14 April 2026.