US Bridges

State Route 116 over Russian River

Fair

Sonoma County, California · 04-SON-116-10.38 · Structure no. 20 0071

Built
1941
84 years old
Condition
Fair
inspected June 2024
Type
Slab
Concrete Continuous
Length
253 ft
14 main spans
Daily traffic
8,450
2016 count
Owner
State
State Highway Agency

About this bridge

State Route 116 over Russian River is a concrete continuous slab carrying State Route 116 over Russian River in Sonoma County, California. It was built in 1941, so it is 84 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 8,450 vehicles a day, roughly 4% of them trucks, projected to reach 8,598 by 2046. The structure is 253 ft (77.1 m) long and 31 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

Location

Open in Google Maps
CarriesState Route 116
CrossesRussian River
Location04-SON-116-10.38
RouteState Highway 116
CountySonoma County
StateCalifornia
Coordinates38.48759, -123.01579
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.2 US tons
Inventory rating28.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans14
Design loadH 20
Structure length253 ft (77.1 m)
Longest span20 ft (6.1 m)
Deck width31 ft (9.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,450 (2016)
Projected traffic8,598 by 2046
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRelief for waterway
Detour if closed24.2 mi (39 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Route 116 over Russian River built?

It was built in 1941, making it 84 years old in 2025.

What condition is State Route 116 over Russian River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in June 2024.

How much traffic does State Route 116 over Russian River carry?

About 8,450 vehicles per day (2016 count), of which roughly 4% are trucks.

How long is State Route 116 over Russian River?

The structure is 253 ft (77.1 m) long with a longest span of 20 ft (6.1 m) and a deck 31 ft wide.

Who owns State Route 116 over Russian River?

It is owned by the State Highway Agency.