US Bridges

State Highway 138 over West Fork Mojave River

Good

San Bernardino County, California · 08-SBD-138-R26.48 · Structure no. 54 0846

Built
1968
57 years old
Condition
Good
inspected September 2024
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
176 ft
3 main spans
Daily traffic
1,600
2021 count
Owner
State
State Highway Agency

About this bridge

State Highway 138 over West Fork Mojave River is a concrete continuous box beam or girders - multiple carrying State Highway 138 over West Fork Mojave River in San Bernardino County, California. It was built in 1968, so it is 57 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 1,600 vehicles a day, roughly 6% of them trucks, projected to reach 2,000 by 2044. The structure is 176 ft (53.6 m) long and 42 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesState Highway 138
CrossesWest Fork Mojave River
Location08-SBD-138-R26.48
RouteState Highway 138
Coordinates34.28807, -117.3553
Functional classRural Minor Arterial

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 inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating45.7 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length176 ft (53.6 m)
Longest span94 ft (28.7 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2021)
Projected traffic2,000 by 2044
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed1.2 mi (2 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was State Highway 138 over West Fork Mojave River built?

It was built in 1968, making it 57 years old in 2025.

What condition is State Highway 138 over West Fork Mojave River 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 September 2024.

How much traffic does State Highway 138 over West Fork Mojave River carry?

About 1,600 vehicles per day (2021 count), of which roughly 6% are trucks.

How long is State Highway 138 over West Fork Mojave River?

The structure is 176 ft (53.6 m) long with a longest span of 94 ft (28.7 m) and a deck 42 ft wide.

Who owns State Highway 138 over West Fork Mojave River?

It is owned by the State Highway Agency.