US Bridges

State Route 116 over Russian River

Fair

Sonoma County, California · 04-SON-116-R12.19 · Structure no. 20 0254

Built
1998
27 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
805 ft
4 main spans
Daily traffic
8,450
2014 count
Owner
State
State Highway Agency

About this bridge

State Route 116 over Russian River is a prestressed concrete continuous box beam or girders - multiple carrying State Route 116 over Russian River in Sonoma County, California. It was built in 1998, so it is 27 years old, younger 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 8,569 by 2044. The structure is 805 ft (245.4 m) long and 44 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesState Route 116
CrossesRussian River
Location04-SON-116-R12.19
RouteState Highway 116
Coordinates38.50226, -122.99529
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.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than 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 alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length805 ft (245.4 m)
Longest span230 ft (70.1 m)
Deck width44 ft (13.3 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,450 (2014)
Projected traffic8,569 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 116 over Russian River built?

It was built in 1998, making it 27 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 (2014 count), of which roughly 4% are trucks.

How long is State Route 116 over Russian River?

The structure is 805 ft (245.4 m) long with a longest span of 230 ft (70.1 m) and a deck 44 ft wide.

Who owns State Route 116 over Russian River?

It is owned by the State Highway Agency.