US Bridges

SR 84 (isabel Ave) over Arroyo Las Positas

Fair

Alameda County, California · 04-ALA-084-M27.74-LVMR · Structure no. 33 0724

Built
2011
14 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Concrete
Length
189 ft
1 main span
Daily traffic
30,000
2012 count
Owner
State
State Highway Agency

About this bridge

SR 84 (isabel Ave) over Arroyo Las Positas is a concrete box beam or girders - multiple carrying SR 84 (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 30,000 vehicles a day, roughly 5% of them trucks, projected to reach 47,619 by 2043. The structure is 189 ft (57.7 m) long and 129 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesSR 84 (isabel Ave)
CrossesArroyo Las Positas
Location04-ALA-084-M27.74-LVMR
RouteState Highway 84
CountyAlameda County
StateCalifornia
Coordinates37.69644, -121.80507
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy5: 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
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length189 ft (57.7 m)
Longest span187 ft (57 m)
Deck width129 ft (39.4 m)
Roadway width122 ft (37.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,000 (2012)
Projected traffic47,619 by 2043
Trucks5%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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 SR 84 (isabel Ave) over Arroyo Las Positas built?

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

What condition is SR 84 (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 August 2023.

How much traffic does SR 84 (isabel Ave) over Arroyo Las Positas carry?

About 30,000 vehicles per day (2012 count), of which roughly 5% are trucks.

How long is SR 84 (isabel Ave) over Arroyo Las Positas?

The structure is 189 ft (57.7 m) long with a longest span of 187 ft (57 m) and a deck 129 ft wide.

Who owns SR 84 (isabel Ave) over Arroyo Las Positas?

It is owned by the State Highway Agency.