US Bridges

Fourth Street over Route 101

Good

Los Angeles County, California · 07-LA-101-S0.62-LA · Structure no. 53 0583

Built
1947
78 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
167 ft
4 main spans
Daily traffic
50,000
2021 count
Owner
State
State Highway Agency

About this bridge

Fourth Street over Route 101 is a concrete continuous box beam or girders - multiple carrying Fourth Street over Route 101 in Los Angeles County, California. It was built in 1947, so it is 78 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 50,000 vehicles a day, roughly 2% of them trucks, projected to reach 65,000 by 2043. The structure is 167 ft (50.9 m) long and 70 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesFourth Street
CrossesRoute 101
Location07-LA-101-S0.62-LA
RouteCity Street 0L280
Coordinates34.04289, -118.22132
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.8 US tons
Inventory rating18.2 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length167 ft (50.9 m)
Longest span49 ft (14.9 m)
Deck width70 ft (21.2 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50,000 (2021)
Projected traffic65,000 by 2043
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 Fourth Street over Route 101 built?

It was built in 1947, making it 78 years old in 2025.

What condition is Fourth Street over Route 101 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 April 2023.

How much traffic does Fourth Street over Route 101 carry?

About 50,000 vehicles per day (2021 count), of which roughly 2% are trucks.

How long is Fourth Street over Route 101?

The structure is 167 ft (50.9 m) long with a longest span of 49 ft (14.9 m) and a deck 70 ft wide.

Who owns Fourth Street over Route 101?

It is owned by the State Highway Agency.