California "C" County Routes

A uniform numbering system has been adopted to uniquely identify county routes across the state of California. Within this system, each route designation has a letter and number combination. The first digit is a letter, and the second and third digits are numbers. The lower letters are generally to the north of the state, and the higher numbers are generally located in the southern part of the state. The lowest route is Lassen County Route A-1, and the highest route is Imperial County Route S-80.

This page profiles the "C" series of county routes, located in Sonoma County.


Sonoma County Route C-1/Canyon Road west
After departing from U.S. 101/Redwood Highway, unsigned Sonoma County Route C-1 follows Canyon Road west toward Lake Sonoma. The route jogs to the large reservoir by way of Canyon Road, Dry Creek Road, and the Lake Sonoma access route. Photo taken 05/25/06.
Westbound Sonoma County Route C-1/Canyon Road meets Dry Creek Road. Turn right to follow the county road northwest to Lake Sonoma. Photo taken 05/25/06.
Sonoma County Route C-1/Dry Creek Road east
Sonoma County Route C-1 travels northwest on Dry Creek Road toward Lake Sonoma, passing by farms and vineyards. Photo taken 05/25/06.
At a sharp turn in the road, the Lake Sonoma dam comes into view on westbound Dry Creek Road. Photo taken 05/25/06.
This bridge carries the county road over the spillway from the Lake Sonoma Dam. Photo taken 05/25/06.

Sonoma County Route C-1/Lake Sonoma east
Entering the Lake Sonoma recreation area (U.S. Army Corps of Engineers), the county road now follows Stewarts Point-Skaggs Springs Road. Photo taken 05/25/06.
Stewarts Point-Skaggs Springs Road ascends the grade to the top of the reservoir. Photo taken 05/25/06.
To California 1, use Stewarts Point-Skaggs Springs Road west (35 miles). Continue straight ahead to follow Rockpile Road to the Lake Sonoma recreation area. Photo taken 05/25/06.
After the split from Stewarts Point-Skaggs Springs Road, Rockpile Road crosses a towering steel arch bridge to cross Lake Sonoma and connect to a marina and other facilities on the northern side. Photo taken 05/25/06.
Sidewalks for pedestrians are in place on both sides of Rockpile Road as it travels over the distant waters below. Climbing and jumping from the bridge are prohibited. Photo taken 05/25/06.
According to this date stamp, the Rockpile Road bridge over the lake was built in 1973. Photo taken 05/25/06.
View of Lake Sonoma and its dam as seen from the Rockpile Bridge. Photo taken 05/25/06.
At the crest of the bridge, the road seems to disappear into the trees in the distance, while in reality the road drops down to land on the other side. Photo taken 05/25/06.
This is another view of the blue-green waters of Lake Sonoma, a reservoir created by the dam. Photo taken 05/25/06.
A parking area comes into view as Rockpile Road lands on the northwest side of the lake. Photo taken 05/25/06.
Sonoma County Route C-1/Lake Sonoma east
Eastbound Rockpile Road approaches the Little Flat parking area. Photo taken 05/25/06.
This side view of the Rockpile Road bridge shows the steel arch bridge in all its glory. Photo taken 05/25/06.
Views of Rockpile Road looking eastbound across the steel arch bridge. Photos taken 05/25/06.
Eastbound Rockpile Road approaches the marina and Lake Sonoma overlook. Continue straight ahead to follow Sonoma County Route C-1 east to U.S. 101. Photo taken 05/25/06.
Rockpile Road travels down from the lake access points to the base of the dam. Photo taken 05/25/06.
At the base of the hill is the park headquarters and sheriff's office. Photo taken 05/25/06.
Sonoma County Route C-1/Dry Creek Road east
Leaving the Lake Sonoma recreation area, eastbound Sonoma County Route C-1 follows Dry Creek Road by crossing over the spillway for Lake Sonoma. Photo taken 05/25/06.
Vineyards line both sides of Dry Creek Road as it travels southeast toward Canyon Road and U.S. 101. Photos taken 05/25/06.
Eastbound Sonoma County Route C-1/Dry Creek Road approaches Yoakim Bridge Road. Photo taken 05/25/06.
Turn left on Canyon Road to follow Sonoma County Route C-1 (unsigned) east to U.S. 101 and Geyserville. Photo taken 05/25/06.
Sonoma County Route C-1/Canyon Road east
Now traveling east on Sonoma County Route C-1/Canyon Road, farms and ranch-style houses line both sides of the road. Photo taken 05/25/06.
Eastbound Sonoma County Route C-1 comes to an end as Canyon Road approaches its junction with U.S. 101 and California 128 near Geyserville. California 128 continues straight ahead into Geyserville. Photo taken 05/25/06.
The second ramp connects to U.S. 101 north and California 128 west to Cloverdale, while Canyon Road continues east into Geyserville along with California 128 east. Photo taken 05/25/06.

Back to County Route B-2  Return to the California Gateway  Continue to County Route E-1

Page Updated February 8, 2007.

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