California State Route 116
Map of Sonoma County in western California with SR 116 highlighted in red
|Defined by Streets and Highways Code § 416|
|Maintained by Caltrans|
|Length||46.500 mi (74.834 km)|
SR 116 is broken into pieces, and the length does not reflect the US 101 overlap that would be required to make the route continuous.
| Scenic Highway|
From SR 1 to the Sebastopol city limit
|West end||SR 1 near Jenner|
|East end||SR 121 near Sonoma|
At the intersection of the Guerneville Bridge, the route turns southeast and passes through Forestville. River Road continues eastward as a county road towards Fulton and Santa Rosa. The section of 116 connecting Guerneville and Forestville is known as Pocket Canyon Road, named for the canyon it passes through. The four east-west blocks of Forestville through which 116 passes are called Front Street, but the route veers south again towards Graton and Sebastopol. Here it is called Gravenstein Highway North until the intersection with Covert Street in Sebastopol. There it undergoes another name change: Healdsburg Avenue. But it doesn't last long—heading south (right turn), it becomes North Main Street for two blocks where it intersects Bodega Highway State Route 12), whereupon it becomes South Main Street. When the one-way street becomes a two-way street again, 116 is known as Gravenstein Highway South all the way to Cotati where it runs concurrently with U.S. Route 101 as the Redwood Highway south to Petaluma. In Petaluma, Lakeville Highway takes 116 to Stage Gulch Road, which makes a left turn east toward Sonoma, crossing the Sonoma Mountains directly north of Tolay Lake and descending into the Sonoma Valley. In Sonoma, 116 runs along Arnold Drive to its terminus at State Route 121 near Schellville.
SR 116 is part of the California Freeway and Expressway System, and a portion just west of US 101 is part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. SR 116 is eligible to be included in the State Scenic Highway System,; however, it is only a scenic highway as designated by Caltrans from SR 1 to the Sebastopol city limit, meaning that it is a substantial section of highway passing through a "memorable landscape" with no "visual intrusions", where the potential designation has gained popular favor with the community.
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions). Segments that remain unconstructed or have been relinquished to local control may be omitted. The entire route is in Sonoma County.
|||0.00||SR 1 – Bodega Bay, Jenner, Fort Bragg||West end of SR 116|
|||21.80||Guerneville Road – Santa Rosa|
|SR 12 east (Sebastopol Avenue, Bodega Avenue) – Santa Rosa|
|US 101 north (Redwood Highway) / Gravenstein Highway – Eureka||Interchange; west end of US 101 overlap|
|West end of freeway on US 101|
|12.00[N 1]||481A||West Sierra Avenue – Cotati|
|||10.67[N 1]||479||Railroad Avenue|
|Petaluma||5.76[N 1]||476||Old Redwood Highway, Petaluma Boulevard North (US 101 Bus. south) – Penngrove|
|4.76[N 1]||474||East Washington Street – Central Petaluma|
|East end of freeway on US 101|
|US 101 south (Redwood Highway) / Lakeville Street – San Francisco||Interchange; east end of US 101 overlap|
|||39.27||Lakeville Road – Lakeville, Vallejo|
|||44.84||Arnold Drive – Sonoma|
|||46.75||SR 121 / Bonneau Road – San Francisco, Napa||East end of SR 116|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Indicates that the postmile represents the distance along US 101 rather than SR 116.
- "OFFICIALLY DESIGNATED STATE SCENIC HIGHWAYS AND HISTORIC PARKWAYS". California Department of Transportation. Retrieved March 27, 2019.
- California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on June 30, 2015. Retrieved June 30, 2015.
- "Article 2 of Chapter 2 of Division 1 of the California Streets and Highways Code". Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
- Federal Highway Administration (March 25, 2015). National Highway System: Santa Rosa, CA (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved September 30, 2017.
- Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
- "Article 2.5 of Chapter 2 of Division 1 of the California Streets & Highways Code". California Office of Legislative Counsel. Retrieved February 6, 2019.
- California Department of Transportation (September 7, 2011). "Officially Designated State Scenic Highways and Historic Parkways". Sacramento: California Department of Transportation. Retrieved September 30, 2017.
- California Department of Transportation (2012). Scenic Highway Guidelines (PDF). Sacramento: California Department of Transportation. p. 5. Retrieved June 8, 2017.
- California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
- California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
- California Department of Transportation, California Numbered Exit Uniform System, U.S. Route 101 Freeway Interchanges, Retrieved on 2009-02-07.
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