US Bridges

Concord Ave over Walnut Creek

Fair

Contra Costa County, California · 0.83 MI E SH 680 · Structure no. 28C0091L

Built
1964
61 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
380 ft
5 main spans
Daily traffic
17,732
1978 count
Owner
City
City or Municipal Highway Agency

About this bridge

Concord Ave over Walnut Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying Concord Ave over Walnut Creek in Contra Costa County, California. It was built in 1964, so it is 61 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 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 17,732 vehicles a day, roughly 7% of them trucks, projected to reach 29,538 by 2047. The structure is 380 ft (115.9 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesConcord Ave
CrossesWalnut Creek
Location0.83 MI E SH 680
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.98072, -122.05231
Functional classUrban Other Principal 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating32.8 US tons
Inventory rating22.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length380 ft (115.9 m)
Longest span76 ft (23.1 m)
Deck width43 ft (13.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,732 (1978)
Projected traffic29,538 by 2047
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Concord Ave over Walnut Creek built?

It was built in 1964, making it 61 years old in 2025.

What condition is Concord Ave over Walnut 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 2025.

How much traffic does Concord Ave over Walnut Creek carry?

About 17,732 vehicles per day (1978 count), of which roughly 7% are trucks.

How long is Concord Ave over Walnut Creek?

The structure is 380 ft (115.9 m) long with a longest span of 76 ft (23.1 m) and a deck 43 ft wide.

Who owns Concord Ave over Walnut Creek?

It is owned by the City or Municipal Highway Agency.