US Bridges

State Route 91 over Studebaker Road

Good

Los Angeles County, California · 07-LA-091-R17.08-CRTS · Structure no. 53 1706

Built
1968
57 years old
Condition
Good
inspected August 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
143 ft
1 main span
Daily traffic
270,000
2019 count
Owner
State
State Highway Agency

About this bridge

State Route 91 over Studebaker Road is a prestressed concrete box beam or girders - multiple carrying State Route 91 over Studebaker Road in Los Angeles County, California. It was built in 1968, so it is 57 years old, older 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 270,000 vehicles a day, roughly 7% of them trucks, projected to reach 258,112 by 2040. The structure is 143 ft (43.6 m) long and 152 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesState Route 91
CrossesStudebaker Road
Location07-LA-091-R17.08-CRTS
RouteState Highway 91
Coordinates33.8762, -118.10002
Functional classUrban Principal Arterial - Other Freeway or Expressway

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 alignment9: Superior to present desirable criteria
Operating rating110 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length143 ft (43.6 m)
Longest span143 ft (43.6 m)
Deck width152 ft (46.3 m)
Roadway width147 ft (44.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic270,000 (2019)
Projected traffic258,112 by 2040
Trucks7%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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 State Route 91 over Studebaker Road built?

It was built in 1968, making it 57 years old in 2025.

What condition is State Route 91 over Studebaker Road 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 State Route 91 over Studebaker Road carry?

About 270,000 vehicles per day (2019 count), of which roughly 7% are trucks.

How long is State Route 91 over Studebaker Road?

The structure is 143 ft (43.6 m) long with a longest span of 143 ft (43.6 m) and a deck 152 ft wide.

Who owns State Route 91 over Studebaker Road?

It is owned by the State Highway Agency.