US Bridges

SR 138 (pearblssm) over Big Rock Wash

Good

Los Angeles County, California · 07-LA-138-61.70 · Structure no. 53 2980

Built
2007
18 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
328 ft
3 main spans
Daily traffic
12,800
2019 count
Owner
State
State Highway Agency

About this bridge

SR 138 (pearblssm) over Big Rock Wash is a prestressed concrete continuous box beam or girders - multiple carrying SR 138 (pearblssm) over Big Rock Wash in Los Angeles County, California. It was built in 2007, so it is 18 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 12,800 vehicles a day, projected to reach 38,434 by 2042. The structure is 328 ft (100 m) long and 82 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesSR 138 (pearblssm)
CrossesBig Rock Wash
Location07-LA-138-61.70
RouteState Highway 138
CountyLos Angeles County
StateCalifornia
Coordinates34.50601, -117.84743
Functional classRural Principal Arterial - Other

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.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length328 ft (100 m)
Longest span131 ft (40 m)
Deck width82 ft (24.9 m)
Roadway width79 ft (24 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,800 (2019)
Projected traffic38,434 by 2042
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 138 (pearblssm) over Big Rock Wash built?

It was built in 2007, making it 18 years old in 2025.

What condition is SR 138 (pearblssm) over Big Rock Wash 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 October 2024.

How much traffic does SR 138 (pearblssm) over Big Rock Wash carry?

About 12,800 vehicles per day (2019 count).

How long is SR 138 (pearblssm) over Big Rock Wash?

The structure is 328 ft (100 m) long with a longest span of 131 ft (40 m) and a deck 82 ft wide.

Who owns SR 138 (pearblssm) over Big Rock Wash?

It is owned by the State Highway Agency.