US Bridges

I-15 (SR-15) Nbl over SR-102 Main Street

Good

Box Elder County, Utah · West of Tremonton · Structure no. 1F 514

Built
1990
35 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
136 ft
1 main span
Daily traffic
14,686
2021 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over SR-102 Main Street is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over SR-102 Main Street in Box Elder County, Utah. It was built in 1990, so it is 35 years old, younger than the Utah average of 40.1 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 14,686 vehicles a day, roughly 35% of them trucks, projected to reach 17,623 by 2041. The structure is 136 ft (41.5 m) long and 56 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-102 Main Street
LocationWest of Tremonton
RouteInterstate 15
CountyBox Elder County
StateUtah
Coordinates41.71083, -112.19222
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
Deck8 Very GoodNo problems noted.
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating56.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length136 ft (41.5 m)
Longest span134 ft (40.8 m)
Deck width56 ft (17.1 m)
Roadway width53 ft (16.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,686 (2021)
Projected traffic17,623 by 2041
Trucks35%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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-102 Main Street built?

It was built in 1990, making it 35 years old in 2025.

What condition is I-15 (SR-15) Nbl over SR-102 Main Street 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 I-15 (SR-15) Nbl over SR-102 Main Street carry?

About 14,686 vehicles per day (2021 count), of which roughly 35% are trucks.

How long is I-15 (SR-15) Nbl over SR-102 Main Street?

The structure is 136 ft (41.5 m) long with a longest span of 134 ft (40.8 m) and a deck 56 ft wide.

Who owns I-15 (SR-15) Nbl over SR-102 Main Street?

It is owned by the State Highway Agency.