California State Route 116

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State Route 116 marker

State Route 116
Route information
Defined by S&HC § 416
Maintained by Caltrans
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.
Major junctions
West end: SR 1 near Jenner
  SR 12 in Sebastopol
US 101 in Petaluma
East end: SR 121 near Sonoma
Highway system
SR 115 SR 118

State Route 116 (SR 116) is a state highway in the U.S. state of California in Sonoma County. The route runs from State Route 1 on the Pacific coast near Jenner to State Route 121 south of Sonoma.

Route description[edit]

This route is part of the California Freeway and Expressway System[2] and is eligible for the State Scenic Highway System.[3] However, it is only a scenic highway as designated by Caltrans from SR 1 to the Sebastopol city limit.[4]

State Route 116 proceeds east along the north bank of the Russian River, from State Route 1 to Guerneville, passing through Duncans Mills, Monte Rio, and Guernewood Park. In this section, it is generally called River Road.

At Guerneville, the route turns south-east and passes through Forestville, Graton, and Sebastopol (where it intersects State Route 12) to join U.S. Route 101 in Cotati. In this section, it is generally called Guerneville Highway or Gravenstein Highway.

Southbound State Route 116 in downtown Sebastopol.

The route follows the U.S. 101 alignment south from Cotati to Petaluma, a stretch Caltrans calls the Cotati Grade.

From southern Petaluma, State Route 116 diverges from 101 and heads east again, crossing the Sonoma Mountains directly north of Tolay Lake and descending into the Sonoma Valley to its terminus at State Route 121. In this section, it goes by several names: Lakeville Highway, Stage Gulch Road, and Arnold Drive.


Major intersections[edit]

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, and T indicates postmiles classified as temporary.[1] The entire route is in Sonoma County.

Location Postmile
[1][5][6]
Exit
[7]
Destinations Notes
  0.00 SR 1 – Bodega Bay, Jenner, Fort Bragg
  21.80 Guerneville Road – Santa Rosa
Sebastopol R26.73–
R26.82
SR 12 east (Sebastopol Avenue, Bodega Avenue) – Santa Rosa
Cotati 35.03
12.69[N 1]
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
3.58[N 1]
35.04
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
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  1. ^ a b c d e f Indicates that the postmile represents the distance along US 101 rather than SR 116.

References[edit]