US Bridges

Main ST-W91 Onramp over Main Street

Good

Los Angeles County, California · 07-LA-091-R6.90-CRSN · Structure no. 53 2547K

Built
1985
40 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
148 ft
1 main span
Daily traffic
800
2015 count
Owner
State
State Highway Agency

About this bridge

Main ST-W91 Onramp over Main Street is a prestressed concrete box beam or girders - multiple carrying Main ST-W91 Onramp over Main Street in Los Angeles County, California. It was built in 1985, so it is 40 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 800 vehicles a day, roughly 2% of them trucks, projected to reach 1,048 by 2040. The structure is 148 ft (45.1 m) long and 28 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesMain ST-W91 Onramp
CrossesMain Street
Location07-LA-091-R6.90-CRSN
RouteState Highway 91
Coordinates33.87303, -118.27575
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 inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length148 ft (45.1 m)
Longest span148 ft (45.1 m)
Deck width28 ft (8.4 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic800 (2015)
Projected traffic1,048 by 2040
Trucks2%
Lanes on structure1
Traffic directionOne-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 Main ST-W91 Onramp over Main Street built?

It was built in 1985, making it 40 years old in 2025.

What condition is Main ST-W91 Onramp over Main Street 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 May 2023.

How much traffic does Main ST-W91 Onramp over Main Street carry?

About 800 vehicles per day (2015 count), of which roughly 2% are trucks.

How long is Main ST-W91 Onramp over Main Street?

The structure is 148 ft (45.1 m) long with a longest span of 148 ft (45.1 m) and a deck 28 ft wide.

Who owns Main ST-W91 Onramp over Main Street?

It is owned by the State Highway Agency.