US Bridges

Laughlin RD over Mark West Creek

Fair

Sonoma County, California · 1 MI N of River RD · Structure no. 20C0246

Built
1910
115 years old
Condition
Fair
inspected June 2023
Type
Arch - Deck
Concrete
Length
91 ft
1 main span
Daily traffic
2,338
2016 count
Owner
County
County Highway Agency

About this bridge

Laughlin RD over Mark West Creek is a concrete arch - deck carrying Laughlin RD over Mark West Creek in Sonoma County, California. It was built in 1910, so it is 115 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.

It carries about 2,338 vehicles a day, roughly 5% of them trucks, projected to reach 3,140 by 2040. The structure is 91 ft (27.7 m) long and 18 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesLaughlin RD
CrossesMark West Creek
Location1 MI N of River RD
RouteCounty Highway 0
CountySonoma County
StateCalifornia
Coordinates38.50015, -122.79874
Functional classRural Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating30.3 US tons
Inventory rating18.2 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length91 ft (27.7 m)
Longest span88 ft (26.7 m)
Deck width18 ft (5.6 m)
Roadway width16 ft (5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,338 (2016)
Projected traffic3,140 by 2040
Trucks5%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Laughlin RD over Mark West Creek built?

It was built in 1910, making it 115 years old in 2025.

What condition is Laughlin 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 June 2023.

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

About 2,338 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is Laughlin RD over Mark West Creek?

The structure is 91 ft (27.7 m) long with a longest span of 88 ft (26.7 m) and a deck 18 ft wide.

Who owns Laughlin RD over Mark West Creek?

It is owned by the County Highway Agency.