US Bridges

State Highway 138 over Interstate 15

Fair

San Bernardino County, California · 08-SBD-138-R15.17 · Structure no. 54 0778

Built
1969
56 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
305 ft
2 main spans
Daily traffic
24,300
2021 count
Owner
State
State Highway Agency

About this bridge

State Highway 138 over Interstate 15 is a steel continuous stringer/multi-beam or girder carrying State Highway 138 over Interstate 15 in San Bernardino County, California. It was built in 1969, so it is 56 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 24,300 vehicles a day, roughly 11% of them trucks, projected to reach 30,000 by 2045. The structure is 305 ft (93 m) long and 58 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesState Highway 138
CrossesInterstate 15
Location08-SBD-138-R15.17
RouteState Highway 138
CountySan Bernardino County
StateCalifornia
Coordinates34.31171, -117.47532
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating33.2 US tons
Inventory rating25.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length305 ft (93 m)
Longest span150 ft (45.7 m)
Deck width58 ft (17.7 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,300 (2021)
Projected traffic30,000 by 2045
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.8 mi (11 km)
TollOn a free road
National Highway SystemNo

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 Highway 138 over Interstate 15 built?

It was built in 1969, making it 56 years old in 2025.

What condition is State Highway 138 over Interstate 15 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 August 2024.

How much traffic does State Highway 138 over Interstate 15 carry?

About 24,300 vehicles per day (2021 count), of which roughly 11% are trucks.

How long is State Highway 138 over Interstate 15?

The structure is 305 ft (93 m) long with a longest span of 150 ft (45.7 m) and a deck 58 ft wide.

Who owns State Highway 138 over Interstate 15?

It is owned by the State Highway Agency.