US Bridges

Wohler RD over Russian River

FairPosted for load

Sonoma County, California · 1.5 MI from River RD · Structure no. 20C0155

Built
1921
104 years old
Condition
Fair
inspected July 2023
Type
Truss - Thru
Steel
Length
758 ft
3 main spans
Daily traffic
828
2016 count
Owner
County
County Highway Agency

About this bridge

Wohler RD over Russian River is a steel truss - thru carrying Wohler RD over Russian River in Sonoma County, California. It was built in 1921, so it is 104 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 828 vehicles a day, roughly 1% of them trucks, projected to reach 989 by 2043. The structure is 758 ft (231 m) long and 17 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesWohler RD
CrossesRussian River
Location1.5 MI from River RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.50768, -122.88522
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating26.1 US tons
Inventory rating15.8 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadUnknown
Structure length758 ft (231 m)
Longest span230 ft (70.1 m)
Deck width17 ft (5.1 m)
Roadway width15 ft (4.5 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic828 (2016)
Projected traffic989 by 2043
Trucks1%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Wohler RD over Russian River built?

It was built in 1921, making it 104 years old in 2025.

What condition is Wohler RD 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 July 2023.

How much traffic does Wohler RD over Russian River carry?

About 828 vehicles per day (2016 count), of which roughly 1% are trucks.

How long is Wohler RD over Russian River?

The structure is 758 ft (231 m) long with a longest span of 230 ft (70.1 m) and a deck 17 ft wide.

Who owns Wohler RD over Russian River?

It is owned by the County Highway Agency.