US Bridges

Wren Ave over Contra Costa Canal

Fair

Contra Costa County, California · 0.05 MI E 6th ST · Structure no. 28C0384

Built
1939
86 years old, rebuilt 2005
Condition
Fair
inspected November 2023
Type
Tee Beam
Concrete
Length
36 ft
1 main span
Daily traffic
850
2000 count
Owner
City
City or Municipal Highway Agency

About this bridge

Wren Ave over Contra Costa Canal is a concrete tee beam carrying Wren Ave over Contra Costa Canal in Contra Costa County, California. It was built in 1939 and reconstructed in 2005, so it is 86 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 850 vehicles a day, roughly 1% of them trucks, projected to reach 2,312 by 2040. The structure is 36 ft (10.9 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesWren Ave
CrossesContra Costa Canal
Location0.05 MI E 6th ST
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.9804, -122.01771
Functional classUrban 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
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 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 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 rating31.7 US tons
Inventory rating19 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length36 ft (10.9 m)
Longest span32 ft (9.9 m)
Deck width38 ft (11.5 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic850 (2000)
Projected traffic2,312 by 2040
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Wren Ave over Contra Costa Canal built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 2005.

What condition is Wren Ave over Contra Costa Canal 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 November 2023.

How much traffic does Wren Ave over Contra Costa Canal carry?

About 850 vehicles per day (2000 count), of which roughly 1% are trucks.

How long is Wren Ave over Contra Costa Canal?

The structure is 36 ft (10.9 m) long with a longest span of 32 ft (9.9 m) and a deck 38 ft wide.

Who owns Wren Ave over Contra Costa Canal?

It is owned by the City or Municipal Highway Agency.