Chileno Valley forms a significant low-lying corridor through the coastal hills of the Northern California dairy country, where the Sonoma and Marin County line bisects the landscape. The terrain is defined by a series of northwest-trending ridges and narrow canyons, including Bolinas Ridge and Frink Canyon, that drain toward the coast. Significant water features like the Soulajule Reservoir and the headwaters of Walker Cr illustrate the drainage patterns of the coastal range, while the southwestern corner of the sheet touches the protected lands of the Golden Gate National Recreation Area near Tomales Bay. The road network, including the Marshall Petaluma Rd and Chileno Valley Rd, follows the natural contours of the valleys, reflecting the historical connection between rural ranching lands and the regional markets of Petaluma.
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1914 · Petaluma
USGS Topo · 1:62,500
1916 · Santa Rosa
USGS Topo · 1:62,500
1916 · Point Reyes
USGS Topo · 1:48,000
1918 · Point Reyes
USGS Topo · 1:62,500
1935 · Sebastopol
USGS Topo · 1:48,000
1942 · Sebastopol
USGS Topo · 1:62,500
1942 · Petaluma
USGS Topo · 1:62,500
1944 · Santa Rosa
USGS Topo · 1:62,500
1947 · Santa Rosa
USGS Topo · 1:250,000
1949 · Santa Rosa
USGS Topo · 1:250,000