US Bridges

I-15 (SR-15) Sbl over I-84 (SR-84)

Good

Box Elder County, Utah · I-15 I-84 Int.-Tremonton · Structure no. 3F 517

Built
1990
35 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
276 ft
2 main spans
Daily traffic
15,266
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over I-84 (SR-84) is a prestressed concrete continuous stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over I-84 (SR-84) 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 15,266 vehicles a day, roughly 35% of them trucks, projected to reach 18,319 by 2043. The structure is 276 ft (84.2 m) long and 44 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-15 (SR-15) Sbl
CrossesI-84 (SR-84)
LocationI-15 I-84 Int.-Tremonton
RouteInterstate 15
CountyBox Elder County
StateUtah
Coordinates41.70505, -112.19272
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
Deck7 GoodSome minor problems.
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 geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.8 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length276 ft (84.2 m)
Longest span136 ft (41.5 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,266 (2023)
Projected traffic18,319 by 2043
Trucks35%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 I-84 (SR-84) built?

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

What condition is I-15 (SR-15) Sbl over I-84 (SR-84) 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) Sbl over I-84 (SR-84) carry?

About 15,266 vehicles per day (2023 count), of which roughly 35% are trucks.

How long is I-15 (SR-15) Sbl over I-84 (SR-84)?

The structure is 276 ft (84.2 m) long with a longest span of 136 ft (41.5 m) and a deck 44 ft wide.

Who owns I-15 (SR-15) Sbl over I-84 (SR-84)?

It is owned by the State Highway Agency.