US Bridges

Harbor Street over State Route 4

Fair

Contra Costa County, California · 04-CC-004-23.41-PIT · Structure no. 28 0385

Built
2003
22 years old
Condition
Fair
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
297 ft
2 main spans
Daily traffic
17,284
2017 count
Owner
State
State Highway Agency

About this bridge

Harbor Street over State Route 4 is a prestressed concrete continuous box beam or girders - multiple carrying Harbor Street over State Route 4 in Contra Costa County, California. It was built in 2003, so it is 22 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 17,284 vehicles a day, roughly 8% of them trucks, projected to reach 22,185 by 2045. The structure is 297 ft (90.5 m) long and 85 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesHarbor Street
CrossesState Route 4
Location04-CC-004-23.41-PIT
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates38.01574, -121.88294
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
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length297 ft (90.5 m)
Longest span162 ft (49.5 m)
Deck width85 ft (25.8 m)
Roadway width70 ft (21.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,284 (2017)
Projected traffic22,185 by 2045
Trucks8%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed0.6 mi (1 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 Harbor Street over State Route 4 built?

It was built in 2003, making it 22 years old in 2025.

What condition is Harbor Street 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 May 2023.

How much traffic does Harbor Street over State Route 4 carry?

About 17,284 vehicles per day (2017 count), of which roughly 8% are trucks.

How long is Harbor Street over State Route 4?

The structure is 297 ft (90.5 m) long with a longest span of 162 ft (49.5 m) and a deck 85 ft wide.

Who owns Harbor Street over State Route 4?

It is owned by the State Highway Agency.