US Bridges

Walnut Ave over Contra Costa Canal

Good

Contra Costa County, California · 0.01 MI E the Alameda · Structure no. 28C0436

Built
1955
70 years old
Condition
Good
inspected November 2023
Type
Tee Beam
Concrete
Length
28 ft
1 main span
Daily traffic
300
1983 count
Owner
City
City or Municipal Highway Agency

About this bridge

Walnut Ave over Contra Costa Canal is a concrete tee beam carrying Walnut Ave over Contra Costa Canal in Contra Costa County, California. It was built in 1955, so it is 70 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 300 vehicles a day, roughly 2% of them trucks, projected to reach 428 by 2040. The structure is 28 ft (8.6 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesWalnut Ave
CrossesContra Costa Canal
Location0.01 MI E the Alameda
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.97454, -122.01738
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to 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 alignment6: Equal to present minimum criteria
Operating rating40.7 US tons
Inventory rating24.7 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length28 ft (8.6 m)
Longest span27 ft (8.2 m)
Deck width28 ft (8.6 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (1983)
Projected traffic428 by 2040
Trucks2%
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 Walnut Ave over Contra Costa Canal built?

It was built in 1955, making it 70 years old in 2025.

What condition is Walnut Ave over Contra Costa Canal in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.

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

About 300 vehicles per day (1983 count), of which roughly 2% are trucks.

How long is Walnut Ave over Contra Costa Canal?

The structure is 28 ft (8.6 m) long with a longest span of 27 ft (8.2 m) and a deck 28 ft wide.

Who owns Walnut Ave over Contra Costa Canal?

It is owned by the City or Municipal Highway Agency.