US Bridges

State Route 1 over State Route 103

Fair

Los Angeles County, California · 07-LA-001-8.27-LBCH · Structure no. 53 0145

Built
1948
77 years old
Condition
Fair
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
204 ft
4 main spans
Daily traffic
31,900
2023 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over State Route 103 is a steel stringer/multi-beam or girder carrying State Route 1 over State Route 103 in Los Angeles County, California. It was built in 1948, so it is 77 years old, older 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 6 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 31,900 vehicles a day, roughly 11% of them trucks, projected to reach 77,684 by 2045. The structure is 204 ft (62.2 m) long and 112 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesState Route 103
Location07-LA-001-8.27-LBCH
RouteState Highway 1
CountyLos Angeles County
StateCalifornia
Coordinates33.78999, -118.22464
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.8 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length204 ft (62.2 m)
Longest span52 ft (15.8 m)
Deck width112 ft (34.1 m)
Roadway width94 ft (28.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,900 (2023)
Projected traffic77,684 by 2045
Trucks11%
Lanes on structure8
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 State Route 1 over State Route 103 built?

It was built in 1948, making it 77 years old in 2025.

What condition is State Route 1 over State Route 103 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 December 2023.

How much traffic does State Route 1 over State Route 103 carry?

About 31,900 vehicles per day (2023 count), of which roughly 11% are trucks.

How long is State Route 1 over State Route 103?

The structure is 204 ft (62.2 m) long with a longest span of 52 ft (15.8 m) and a deck 112 ft wide.

Who owns State Route 1 over State Route 103?

It is owned by the State Highway Agency.