US Bridges

I-15 (SR-15) Sbl over SR-13 and UPRR

Fair

Box Elder County, Utah · North Brigham Interchange · Structure no. 3C 334

Built
1967
58 years old, rebuilt 2021
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
240 ft
3 main spans
Daily traffic
32,262
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over SR-13 and UPRR is a steel continuous stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over SR-13 and UPRR in Box Elder County, Utah. It was built in 1967 and reconstructed in 2021, so it is 58 years old, older than the Utah average of 40.1 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 32,262 vehicles a day, roughly 31% of them trucks, projected to reach 38,714 by 2043. The structure is 240 ft (73.1 m) long and 67 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 (SR-15) Sbl
CrossesSR-13 and UPRR
LocationNorth Brigham Interchange
RouteInterstate 15
CountyBox Elder County
StateUtah
Coordinates41.5355, -112.06642
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length240 ft (73.1 m)
Longest span156 ft (47.5 m)
Deck width67 ft (20.4 m)
Roadway width64 ft (19.4 m)
Vertical clearance over deck2 ft (0.6 m)

Traffic and service

Average daily traffic32,262 (2023)
Projected traffic38,714 by 2043
Trucks31%
Lanes on structure3
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and railroad
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 I-15 (SR-15) Sbl over SR-13 and UPRR built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2021.

What condition is I-15 (SR-15) Sbl over SR-13 and UPRR 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 May 2023.

How much traffic does I-15 (SR-15) Sbl over SR-13 and UPRR carry?

About 32,262 vehicles per day (2023 count), of which roughly 31% are trucks.

How long is I-15 (SR-15) Sbl over SR-13 and UPRR?

The structure is 240 ft (73.1 m) long with a longest span of 156 ft (47.5 m) and a deck 67 ft wide.

Who owns I-15 (SR-15) Sbl over SR-13 and UPRR?

It is owned by the State Highway Agency.