US Bridges

Laurel Road over Marsh Creek

Fair

Contra Costa County, California · 488 M. E. Main ST./SR-4 · Structure no. 28C0267

Built
1990
35 years old
Condition
Fair
inspected January 2023
Type
Box Beam or Girders - Multiple
Concrete
Length
86 ft
1 main span
Daily traffic
4,200
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Laurel Road over Marsh Creek is a concrete box beam or girders - multiple carrying Laurel Road over Marsh Creek in Contra Costa County, California. It was built in 1990, so it is 35 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 4,200 vehicles a day, roughly 5% of them trucks, projected to reach 2,810 by 2041. The structure is 86 ft (26.1 m) long and 36 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesLaurel Road
CrossesMarsh Creek
Location488 M. E. Main ST./SR-4
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.98332, -121.69013
Functional classUrban 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 protection8 Very GoodNo problems noted.
Last inspectionJanuary 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length86 ft (26.1 m)
Longest span86 ft (26.1 m)
Deck width36 ft (11.1 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,200 (2020)
Projected traffic2,810 by 2041
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Laurel Road over Marsh Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is Laurel Road over Marsh 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 January 2023.

How much traffic does Laurel Road over Marsh Creek carry?

About 4,200 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Laurel Road over Marsh Creek?

The structure is 86 ft (26.1 m) long with a longest span of 86 ft (26.1 m) and a deck 36 ft wide.

Who owns Laurel Road over Marsh Creek?

It is owned by the City or Municipal Highway Agency.