US Bridges

Interstate 15 NB over Interstate 10

Fair

San Bernardino County, California · 08-SBD-015-2.37-ONT · Structure no. 54 0909R

Built
1975
50 years old
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
234 ft
2 main spans
Daily traffic
105,500
2022 count
Owner
State
State Highway Agency

About this bridge

Interstate 15 NB over Interstate 10 is a prestressed concrete continuous box beam or girders - multiple carrying Interstate 15 NB over Interstate 10 in San Bernardino County, California. It was built in 1975, so it is 50 years old, younger 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 5 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 105,500 vehicles a day, roughly 10% of them trucks, projected to reach 133,064 by 2042. The structure is 234 ft (71.3 m) long and 68 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesInterstate 15 NB
CrossesInterstate 10
Location08-SBD-015-2.37-ONT
RouteInterstate 15
CountySan Bernardino County
StateCalifornia
Coordinates34.06719, -117.54473
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.3 US tons
Inventory rating40.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length234 ft (71.3 m)
Longest span116 ft (35.4 m)
Deck width68 ft (20.7 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic105,500 (2022)
Projected traffic133,064 by 2042
Trucks10%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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 15 NB over Interstate 10 built?

It was built in 1975, making it 50 years old in 2025.

What condition is Interstate 15 NB over Interstate 10 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 February 2024.

How much traffic does Interstate 15 NB over Interstate 10 carry?

About 105,500 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is Interstate 15 NB over Interstate 10?

The structure is 234 ft (71.3 m) long with a longest span of 116 ft (35.4 m) and a deck 68 ft wide.

Who owns Interstate 15 NB over Interstate 10?

It is owned by the State Highway Agency.