US Bridges

San Pablo Dam Road over Interstate 80

Fair

Contra Costa County, California · 04-CC-080-4.34-SPB · Structure no. 28 0089

Built
1956
69 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
129 ft
2 main spans
Daily traffic
29,196
2019 count
Owner
State
State Highway Agency

About this bridge

San Pablo Dam Road over Interstate 80 is a concrete continuous box beam or girders - multiple carrying San Pablo Dam Road over Interstate 80 in Contra Costa County, California. It was built in 1956, so it is 69 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 29,196 vehicles a day, roughly 1% of them trucks, projected to reach 43,614 by 2041. The structure is 129 ft (39.4 m) long and 62 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSan Pablo Dam Road
CrossesInterstate 80
Location04-CC-080-4.34-SPB
RouteCity Street 0
CountyContra Costa County
StateCalifornia
Coordinates37.95576, -122.32998
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
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 inspectionJuly 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 geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.7 US tons
Inventory rating28.2 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length129 ft (39.4 m)
Longest span60 ft (18.3 m)
Deck width62 ft (18.9 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,196 (2019)
Projected traffic43,614 by 2041
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes

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 San Pablo Dam Road over Interstate 80 built?

It was built in 1956, making it 69 years old in 2025.

What condition is San Pablo Dam Road over Interstate 80 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 July 2023.

How much traffic does San Pablo Dam Road over Interstate 80 carry?

About 29,196 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is San Pablo Dam Road over Interstate 80?

The structure is 129 ft (39.4 m) long with a longest span of 60 ft (18.3 m) and a deck 62 ft wide.

Who owns San Pablo Dam Road over Interstate 80?

It is owned by the State Highway Agency.