US Bridges

Delta Road over Marsh Creek

Poor

Contra Costa County, California · 0.8 MI E of SH4 · Structure no. 28C0211

Built
1965
60 years old
Condition
Poor
inspected January 2025
Type
Tee Beam
Concrete
Length
58 ft
1 main span
Daily traffic
4,147
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Delta Road over Marsh Creek is a concrete tee beam carrying Delta Road over Marsh Creek in Contra Costa County, California. It was built in 1965, so it is 60 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 4,147 vehicles a day, roughly 5% of them trucks, projected to reach 2,799 by 2047. The structure is 58 ft (17.7 m) long and 52 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesDelta Road
CrossesMarsh Creek
Location0.8 MI E of SH4
RouteCounty Highway 0
CountyContra Costa County
StateCalifornia
Coordinates37.96881, -121.68274
Functional classRural Minor Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating31.1 US tons
Inventory rating18.5 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length58 ft (17.7 m)
Longest span53 ft (16.2 m)
Deck width52 ft (15.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,147 (2020)
Projected traffic2,799 by 2047
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$470,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Delta Road over Marsh Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Delta Road over Marsh Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.

How much traffic does Delta Road over Marsh Creek carry?

About 4,147 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Delta Road over Marsh Creek?

The structure is 58 ft (17.7 m) long with a longest span of 53 ft (16.2 m) and a deck 52 ft wide.

Who owns Delta Road over Marsh Creek?

It is owned by the City or Municipal Highway Agency.