US Bridges

Interstate 15 SB over Metrolink & BNSF RY

Fair

San Bernardino County, California · 08-SBD-015-4.10-RCUC · Structure no. 54 0919L

Built
1975
50 years old
Condition
Fair
inspected March 2023
Type
Box Beam or Girders - Multiple
Concrete Continuous
Length
159 ft
3 main spans
Daily traffic
98,000
2020 count
Owner
State
State Highway Agency

About this bridge

Interstate 15 SB over Metrolink & BNSF RY is a concrete continuous box beam or girders - multiple carrying Interstate 15 SB over Metrolink & BNSF RY 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 98,000 vehicles a day, roughly 10% of them trucks, projected to reach 136,200 by 2042. The structure is 159 ft (48.5 m) long and 68 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesInterstate 15 SB
CrossesMetrolink & BNSF RY
Location08-SBD-015-4.10-RCUC
RouteInterstate 15
CountySan Bernardino County
StateCalifornia
Coordinates34.09218, -117.54397
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
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 rating60.4 US tons
Inventory rating46.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length159 ft (48.5 m)
Longest span65 ft (19.8 m)
Deck width68 ft (20.7 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic98,000 (2020)
Projected traffic136,200 by 2042
Trucks10%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 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 15 SB over Metrolink & BNSF RY built?

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

What condition is Interstate 15 SB over Metrolink & BNSF RY 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 March 2023.

How much traffic does Interstate 15 SB over Metrolink & BNSF RY carry?

About 98,000 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Interstate 15 SB over Metrolink & BNSF RY?

The structure is 159 ft (48.5 m) long with a longest span of 65 ft (19.8 m) and a deck 68 ft wide.

Who owns Interstate 15 SB over Metrolink & BNSF RY?

It is owned by the State Highway Agency.