US Bridges

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

Fair

Box Elder County, Utah · North Brigham Interchange · Structure no. 1C 334

Built
1967
58 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
240 ft
3 main spans
Daily traffic
32,262
2017 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over SR-13 and UPRR is a steel continuous stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over SR-13 and UPRR in Box Elder County, Utah. It was built in 1967, 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 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 32,262 vehicles a day, roughly 31% of them trucks, projected to reach 38,714 by 2037. The structure is 240 ft (73.1 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 (SR-15) Nbl
CrossesSR-13 and UPRR
LocationNorth Brigham Interchange
RouteInterstate 15
CountyBox Elder County
StateUtah
Coordinates41.53497, -112.06595
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.
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating49.3 US tons
Inventory rating26.5 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 width34 ft (10.5 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic32,262 (2017)
Projected traffic38,714 by 2037
Trucks31%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
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) Nbl over SR-13 and UPRR built?

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

What condition is I-15 (SR-15) Nbl 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) Nbl over SR-13 and UPRR carry?

About 32,262 vehicles per day (2017 count), of which roughly 31% are trucks.

How long is I-15 (SR-15) Nbl 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 34 ft wide.

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

It is owned by the State Highway Agency.