US Bridges

Wohler RD over Mark West Creek

Fair

Sonoma County, California · Near River RD · Structure no. 20C0590

Built
2023
2 years old
Condition
Fair
inspected October 2023
Type
Slab
Prestressed Concrete Continuous
Length
159 ft
3 main spans
Daily traffic
500
2015 count
Owner
County
County Highway Agency

About this bridge

Wohler RD over Mark West Creek is a prestressed concrete continuous slab carrying Wohler RD over Mark West Creek in Sonoma County, California. It was built in 2023, so it is 2 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 500 vehicles a day, roughly 2% of them trucks, projected to reach 870 by 2042. The structure is 159 ft (48.5 m) long and 36 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesWohler RD
CrossesMark West Creek
LocationNear River RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.49225, -122.88324
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating46.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length159 ft (48.5 m)
Longest span64 ft (19.5 m)
Deck width36 ft (11 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2015)
Projected traffic870 by 2042
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Wohler RD over Mark West Creek built?

It was built in 2023, making it 2 years old in 2025.

What condition is Wohler RD over Mark West Creek 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 October 2023.

How much traffic does Wohler RD over Mark West Creek carry?

About 500 vehicles per day (2015 count), of which roughly 2% are trucks.

How long is Wohler RD over Mark West Creek?

The structure is 159 ft (48.5 m) long with a longest span of 64 ft (19.5 m) and a deck 36 ft wide.

Who owns Wohler RD over Mark West Creek?

It is owned by the County Highway Agency.