 State Route 116 | ||||
|---|---|---|---|---|
 Map of Sonoma County in western California with SR 116 highlighted in red | ||||
| Route information | ||||
| Maintained byCaltrans | ||||
| Length | 46.500 mi[1] (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. | |||
| Tourist routes |  SR 116 betweenSR 1 and theSebastopol city limit[2] | |||
| Major junctions | ||||
| West end |  SR 1 nearJenner | |||
| Major intersections |
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| East end |  SR 121 nearSonoma | |||
| Location | ||||
| Country | United States | |||
| State | California | |||
| Counties | Sonoma | |||
| Highway system | ||||
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State Route 116 (SR 116) is astate highway in theU.S. state ofCalifornia inSonoma County. The route runs fromSR 1 on thePacific coast nearJenner toSR 121 south ofSonoma.
SR 116 proceeds east along the north bank of theRussian River, from SR 1 toGuerneville, passing throughDuncans Mills,Monte Rio, andGuernewood Park as River Road.
At the intersection of the Guerneville Bridge, the route turns southeast and passes throughForestville. River Road continues eastward as a country road towardsFulton andSanta Rosa. The section of SR 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 towardsGraton andSebastopol. 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 HighwaySR 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 toCotati where it runs concurrently withU.S. Route 101 (US 101) as the Redwood Highway south to Petaluma. In Petaluma, Lakeville Highway takes SR 116 to Stage Gulch Road, which makes a left turn east toward Sonoma, crossing theSonoma Mountains directly north ofTolay Lake and descending into theSonoma Valley. In Sonoma, SR 116 runs along Arnold Drive to its terminus atSR 121 nearSchellville.
SR 116 is part of theCalifornia Freeway and Expressway System,[3] and a portion just west of US 101 is part of theNational Highway System,[4] a network of highways that are considered essential to the country's economy, defense, and mobility by theFederal Highway Administration.[5] SR 116 is eligible to be included in theState Scenic Highway System,;[6] however, it is only a scenic highway as designated by Caltrans from SR 1 to the Sebastopol city limit,[7] 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.[8]
Except where prefixed with a letter,postmiles were measured on the road as it was in1964, 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 to an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, seeCalifornia postmile § Official postmile definitions).[1] Segments that remain unconstructed or have been relinquished to local control may be omitted. The entire route is inSonoma County.
| Location | Postmile [1][9][10] | Exit [11] | Destinations | Notes | |
|---|---|---|---|---|---|
| | 0.00 | SR 1 –Bodega Bay,Jenner,Fort Bragg | West end of SR 116 | ||
| | 21.80 | Guerneville Road –Santa Rosa | |||
| Sebastopol | R26.73– R26.82 |   SR 12 east (Sebastopol Avenue) / Bodega Avenue –Santa Rosa | Western terminus of SR 12 | ||
| Cotati | 35.03 12.69[N 1] |   US 101 north (Redwood Highway) / Gravenstein Highway –Eureka,Downtown Cotati,Rohnert Park | Interchange; west end of US 101 overlap; US 101 south exit 481 | ||
| 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 | |||
| 3.58[N 1] 35.04 | East end of freeway on US 101 | ||||
 US 101 south (Redwood Highway) / Lakeville Street –San Francisco,Petaluma | Interchange; east end of US 101 overlap; US 101 north exit 472B | ||||
| | 39.27 | Lakeville Road –Lakeville,Vallejo | |||
| | 44.84 | Arnold Drive –Sonoma,Glen Ellen | |||
| | 46.75 | SR 121 (Arnold Drive, Fremont Drive) / Bonneau Road –San Francisco,Napa | East end of SR 116 | ||
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
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