US Bridges

Center Avenue over State Route 4

Fair

Contra Costa County, California · 04-CC-004-R9.18-MTZ · Structure no. 28 0212

Built
1975
50 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
230 ft
2 main spans
Daily traffic
22,000
2018 count
Owner
State
State Highway Agency

About this bridge

Center Avenue over State Route 4 is a prestressed concrete continuous box beam or girders - multiple carrying Center Avenue over State Route 4 in Contra Costa County, California. It was built in 1975, so it is 50 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 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 22,000 vehicles a day, roughly 1% of them trucks, projected to reach 37,408 by 2042. The structure is 230 ft (70.1 m) long and 114 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesCenter Avenue
CrossesState Route 4
Location04-CC-004-R9.18-MTZ
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.9952, -122.12053
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating38.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length230 ft (70.1 m)
Longest span121 ft (36.9 m)
Deck width114 ft (34.8 m)
Roadway width102 ft (31.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,000 (2018)
Projected traffic37,408 by 2042
Trucks1%
Lanes on structure7
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 Center Avenue over State Route 4 built?

It was built in 1975, making it 50 years old in 2025.

What condition is Center Avenue over State Route 4 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 June 2024.

How much traffic does Center Avenue over State Route 4 carry?

About 22,000 vehicles per day (2018 count), of which roughly 1% are trucks.

How long is Center Avenue over State Route 4?

The structure is 230 ft (70.1 m) long with a longest span of 121 ft (36.9 m) and a deck 114 ft wide.

Who owns Center Avenue over State Route 4?

It is owned by the State Highway Agency.