US Bridges

State Route 18 over UP RR

Fair

Los Angeles County, California · 07-LA-018-0.19 · Structure no. 53 2331

Built
1967
58 years old, rebuilt 1997
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
386 ft
6 main spans
Daily traffic
6,800
2019 count
Owner
State
State Highway Agency

About this bridge

State Route 18 over UP RR is a prestressed concrete continuous stringer/multi-beam or girder carrying State Route 18 over UP RR in Los Angeles County, California. It was built in 1967 and reconstructed in 1997, so it is 58 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 5 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 6,800 vehicles a day, roughly 10% of them trucks, projected to reach 9,800 by 2040. The structure is 386 ft (117.7 m) long and 44 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesState Route 18
CrossesUP RR
Location07-LA-018-0.19
RouteState Highway 18
CountyLos Angeles County
StateCalifornia
Coordinates34.49919, -117.66347
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36.8 US tons
Inventory rating16.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length386 ft (117.7 m)
Longest span64 ft (19.5 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,800 (2019)
Projected traffic9,800 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed6.2 mi (10 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 18 over UP RR built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1997.

What condition is State Route 18 over UP RR 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 September 2023.

How much traffic does State Route 18 over UP RR carry?

About 6,800 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is State Route 18 over UP RR?

The structure is 386 ft (117.7 m) long with a longest span of 64 ft (19.5 m) and a deck 44 ft wide.

Who owns State Route 18 over UP RR?

It is owned by the State Highway Agency.