US Bridges

SR 138 (pearblssm) over California Aqueduct

Good

Los Angeles County, California · 07-LA-138-56.06 · Structure no. 53 2098

Built
1970
55 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
144 ft
1 main span
Daily traffic
14,900
2019 count
Owner
State
State Highway Agency

About this bridge

SR 138 (pearblssm) over California Aqueduct is a prestressed concrete box beam or girders - multiple carrying SR 138 (pearblssm) over California Aqueduct in Los Angeles County, California. It was built in 1970, so it is 55 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 14,900 vehicles a day, roughly 6% of them trucks, projected to reach 29,800 by 2042. The structure is 144 ft (44 m) long and 83 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesSR 138 (pearblssm)
CrossesCalifornia Aqueduct
Location07-LA-138-56.06
RouteState Highway 138
Coordinates34.52111, -117.96002
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 protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating30 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length144 ft (44 m)
Longest span144 ft (44 m)
Deck width83 ft (25.3 m)
Roadway width80 ft (24.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,900 (2019)
Projected traffic29,800 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 138 (pearblssm) over California Aqueduct built?

It was built in 1970, making it 55 years old in 2025.

What condition is SR 138 (pearblssm) over California Aqueduct 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 California Aqueduct carry?

About 14,900 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is SR 138 (pearblssm) over California Aqueduct?

The structure is 144 ft (44 m) long with a longest span of 144 ft (44 m) and a deck 83 ft wide.

Who owns SR 138 (pearblssm) over California Aqueduct?

It is owned by the State Highway Agency.