US Bridges

ST RTE 84 (isabel) over Interstate 580

Fair

Alameda County, California · 04-ALA-084-N28.15-LVMR · Structure no. 33 0723

Built
2011
14 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
509 ft
2 main spans
Daily traffic
66,000
2011 count
Owner
State
State Highway Agency

About this bridge

ST RTE 84 (isabel) over Interstate 580 is a prestressed concrete continuous box beam or girders - multiple carrying ST RTE 84 (isabel) over Interstate 580 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 66,000 vehicles a day, roughly 3% of them trucks, projected to reach 156,111 by 2043. The structure is 509 ft (155 m) long and 96 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesST RTE 84 (isabel)
CrossesInterstate 580
Location04-ALA-084-N28.15-LVMR
RouteState Highway 84
CountyAlameda County
StateCalifornia
Coordinates37.70034, -121.80234
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.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: 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 typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length509 ft (155 m)
Longest span262 ft (80 m)
Deck width96 ft (29.3 m)
Roadway width89 ft (27 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic66,000 (2011)
Projected traffic156,111 by 2043
Trucks3%
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 ST RTE 84 (isabel) over Interstate 580 built?

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

What condition is ST RTE 84 (isabel) over Interstate 580 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 ST RTE 84 (isabel) over Interstate 580 carry?

About 66,000 vehicles per day (2011 count), of which roughly 3% are trucks.

How long is ST RTE 84 (isabel) over Interstate 580?

The structure is 509 ft (155 m) long with a longest span of 262 ft (80 m) and a deck 96 ft wide.

Who owns ST RTE 84 (isabel) over Interstate 580?

It is owned by the State Highway Agency.