US Bridges

SR 84 (thornton) over Interstate 880

Good

Alameda County, California · 04-ALA-084-6.93-FMT · Structure no. 33 0264

Built
1997
28 years old
Condition
Good
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
316 ft
2 main spans
Daily traffic
66,000
2010 count
Owner
State
State Highway Agency

About this bridge

SR 84 (thornton) over Interstate 880 is a prestressed concrete continuous box beam or girders - multiple carrying SR 84 (thornton) over Interstate 880 in Alameda County, California. It was built in 1997, so it is 28 years old, younger than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 66,000 vehicles a day, roughly 4% of them trucks, projected to reach 99,116 by 2043. The structure is 316 ft (96.2 m) long and 107 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSR 84 (thornton)
CrossesInterstate 880
Location04-ALA-084-6.93-FMT
RouteState Highway 84
CountyAlameda County
StateCalifornia
Coordinates37.54618, -122.02306
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
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 length316 ft (96.2 m)
Longest span158 ft (48.1 m)
Deck width107 ft (32.6 m)
Roadway width93 ft (28.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic66,000 (2010)
Projected traffic99,116 by 2043
Trucks4%
Lanes on structure6
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 SR 84 (thornton) over Interstate 880 built?

It was built in 1997, making it 28 years old in 2025.

What condition is SR 84 (thornton) over Interstate 880 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does SR 84 (thornton) over Interstate 880 carry?

About 66,000 vehicles per day (2010 count), of which roughly 4% are trucks.

How long is SR 84 (thornton) over Interstate 880?

The structure is 316 ft (96.2 m) long with a longest span of 158 ft (48.1 m) and a deck 107 ft wide.

Who owns SR 84 (thornton) over Interstate 880?

It is owned by the State Highway Agency.