US Bridges

I-15 (SR-15) Sbl over County Road and UPRR

Fair

Box Elder County, Utah · South Tremonton · Structure no. 3F 316

Built
1972
53 years old, rebuilt 1990
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
170 ft
2 main spans
Daily traffic
23,139
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over County Road and UPRR is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over County Road and UPRR in Box Elder County, Utah. It was built in 1972 and reconstructed in 1990, so it is 53 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 23,139 vehicles a day, roughly 35% of them trucks, projected to reach 27,767 by 2043. The structure is 170 ft (51.9 m) long and 53 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
CrossesCounty Road and UPRR
LocationSouth Tremonton
RouteInterstate 15
CountyBox Elder County
StateUtah
Coordinates41.69417, -112.17111
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length170 ft (51.9 m)
Longest span86 ft (26.2 m)
Deck width53 ft (16.1 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic23,139 (2023)
Projected traffic27,767 by 2043
Trucks35%
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) Sbl over County Road and UPRR built?

It was built in 1972, making it 53 years old in 2025. It was reconstructed in 1990.

What condition is I-15 (SR-15) Sbl over County Road 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 April 2023.

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

About 23,139 vehicles per day (2023 count), of which roughly 35% are trucks.

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

The structure is 170 ft (51.9 m) long with a longest span of 86 ft (26.2 m) and a deck 53 ft wide.

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

It is owned by the State Highway Agency.