US Bridges

State Route 4 over Maintenance Access

Fair

Contra Costa County, California · 04-CC-004-24.97-ANT · Structure no. 28 0105

Built
1953
72 years old, rebuilt 2013
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
36 ft
2 main spans
Daily traffic
114,000
2017 count
Owner
State
State Highway Agency

About this bridge

State Route 4 over Maintenance Access is a concrete continuous slab carrying State Route 4 over Maintenance Access in Contra Costa County, California. It was built in 1953 and reconstructed in 2013, so it is 72 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 114,000 vehicles a day, roughly 8% of them trucks, projected to reach 155,167 by 2042. The structure is 36 ft (11.1 m) long and 193 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesState Route 4
CrossesMaintenance Access
Location04-CC-004-24.97-ANT
RouteState Highway 4
CountyContra Costa County
StateCalifornia
Coordinates38.00891, -121.85589
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Last inspectionMay 2023
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 geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating43.5 US tons
Inventory rating26.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length36 ft (11.1 m)
Longest span36 ft (11.1 m)
Deck width193 ft (58.8 m)
Roadway width125 ft (38 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic114,000 (2017)
Projected traffic155,167 by 2042
Trucks8%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 State Route 4 over Maintenance Access built?

It was built in 1953, making it 72 years old in 2025. It was reconstructed in 2013.

What condition is State Route 4 over Maintenance Access 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 May 2023.

How much traffic does State Route 4 over Maintenance Access carry?

About 114,000 vehicles per day (2017 count), of which roughly 8% are trucks.

How long is State Route 4 over Maintenance Access?

The structure is 36 ft (11.1 m) long with a longest span of 36 ft (11.1 m) and a deck 193 ft wide.

Who owns State Route 4 over Maintenance Access?

It is owned by the State Highway Agency.