California State Route 116

State Route 116
Route information
Defined by S&HC § 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.
Major junctions
West end:	SR 1 near Jenner
	SR 12 in Sebastopol US 101 in Petaluma
East end:	SR 121 near Sonoma
Highway system
State highways in California(list • pre-1964) History • Unconstructed • Deleted • Freeway • Scenic ← 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

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

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

Note: Except where prefixed with a letter, postmiles were measured in 1964, based on the alignment as it existed at that time, and do not necessarily reflect current mileage.

The entire route is in Sonoma County.

Location	Postmile	Exit	Destinations	Notes
	0.00		SR 1 – Bodega Bay, Jenner, Fort Bragg
Guerneville			River Road – Rio Nido
	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		US 101 north (Redwood Highway) / Gravenstein Highway – Eureka	Interchange; west end of US 101 overlap
	West end of freeway on US 101
	12.00	481A	West Sierra Avenue – Cotati
	10.67	479	Railroad Avenue
Petaluma	5.76	476	Old Redwood Highway, Petaluma Boulevard North (US 101 Bus. south) – Penngrove
	4.76	474	East Washington Street – Central Petaluma
	East end of freeway on US 101
	3.58 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      Concurrency terminus •      Closed/former •      Incomplete access •      Unopened