US Bridges

Harbor ST over Contra Costa Canal

Fair

Contra Costa County, California · 0.01 MI S Stoneman Ave · Structure no. 28C0093

Built
1966
59 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Concrete
Length
39 ft
1 main span
Daily traffic
13,000
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Harbor ST over Contra Costa Canal is a concrete tee beam carrying Harbor ST over Contra Costa Canal in Contra Costa County, California. It was built in 1966, so it is 59 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 13,000 vehicles a day, roughly 3% of them trucks, projected to reach 7,787 by 2047. The structure is 39 ft (11.9 m) long and 76 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesHarbor ST
CrossesContra Costa Canal
Location0.01 MI S Stoneman Ave
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates38.00362, -121.88501
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
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 above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating35.7 US tons
Inventory rating21.4 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length39 ft (11.9 m)
Longest span37 ft (11.3 m)
Deck width76 ft (23.3 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,000 (2020)
Projected traffic7,787 by 2047
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Harbor ST over Contra Costa Canal built?

It was built in 1966, making it 59 years old in 2025.

What condition is Harbor ST over Contra Costa Canal 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 Harbor ST over Contra Costa Canal carry?

About 13,000 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Harbor ST over Contra Costa Canal?

The structure is 39 ft (11.9 m) long with a longest span of 37 ft (11.3 m) and a deck 76 ft wide.

Who owns Harbor ST over Contra Costa Canal?

It is owned by the City or Municipal Highway Agency.