US Bridges

Interstate 10 over Mountain Avenue

Good

San Bernardino County, California · 08-SBD-010-2.37-UPL · Structure no. 54 1187

Built
2000
25 years old, rebuilt 2022
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
165 ft
2 main spans
Daily traffic
219,000
2021 count
Owner
State
State Highway Agency

About this bridge

Interstate 10 over Mountain Avenue is a concrete continuous box beam or girders - multiple carrying Interstate 10 over Mountain Avenue in San Bernardino County, California. It was built in 2000 and reconstructed in 2022, so it is 25 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 219,000 vehicles a day, roughly 7% of them trucks, projected to reach 280,000 by 2043. The structure is 165 ft (50.2 m) long and 192 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesInterstate 10
CrossesMountain Avenue
Location08-SBD-010-2.37-UPL
RouteInterstate 10
Coordinates34.08707, -117.67042
Functional classUrban Principal Arterial - Interstate

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.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20 + Mod
Structure length165 ft (50.2 m)
Longest span82 ft (25.1 m)
Deck width192 ft (58.4 m)
Roadway width186 ft (56.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic219,000 (2021)
Projected traffic280,000 by 2043
Trucks7%
Lanes on structure14
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Interstate 10 over Mountain Avenue built?

It was built in 2000, making it 25 years old in 2025. It was reconstructed in 2022.

What condition is Interstate 10 over Mountain Avenue 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 April 2023.

How much traffic does Interstate 10 over Mountain Avenue carry?

About 219,000 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is Interstate 10 over Mountain Avenue?

The structure is 165 ft (50.2 m) long with a longest span of 82 ft (25.1 m) and a deck 192 ft wide.

Who owns Interstate 10 over Mountain Avenue?

It is owned by the State Highway Agency.