US Bridges

I580-ISABEL Ave over Arroyo Las Positas

Fair

Alameda County, California · 04-ALA-580-13.86 · Structure no. 33 0012S

Built
2011
14 years old
Condition
Fair
inspected February 2024
Type
Slab
Prestressed Concrete Continuous
Length
169 ft
3 main spans
Daily traffic
1,000
2017 count
Owner
State
State Highway Agency

About this bridge

I580-ISABEL Ave over Arroyo Las Positas is a prestressed concrete continuous slab carrying I580-ISABEL Ave over Arroyo Las Positas in Alameda County, California. It was built in 2011, so it is 14 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 1,000 vehicles a day, roughly 3% of them trucks, projected to reach 1,514 by 2042. The structure is 169 ft (51.5 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesI580-ISABEL Ave
CrossesArroyo Las Positas
Location04-ALA-580-13.86
RouteInterstate 580
CountyAlameda County
StateCalifornia
Coordinates37.70114, -121.79637
Functional classUrban Principal Arterial - Interstate

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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length169 ft (51.5 m)
Longest span66 ft (20.2 m)
Deck width38 ft (11.7 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2017)
Projected traffic1,514 by 2042
Trucks3%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I580-ISABEL Ave over Arroyo Las Positas built?

It was built in 2011, making it 14 years old in 2025.

What condition is I580-ISABEL Ave over Arroyo Las Positas 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 February 2024.

How much traffic does I580-ISABEL Ave over Arroyo Las Positas carry?

About 1,000 vehicles per day (2017 count), of which roughly 3% are trucks.

How long is I580-ISABEL Ave over Arroyo Las Positas?

The structure is 169 ft (51.5 m) long with a longest span of 66 ft (20.2 m) and a deck 38 ft wide.

Who owns I580-ISABEL Ave over Arroyo Las Positas?

It is owned by the State Highway Agency.