US Bridges

I-15 (SR-15) Sbl over Co.Rd Iowa String Road)

Fair

Box Elder County, Utah · I-15 I-84 Int.Tremonton · Structure no. 3F 515

Built
1990
35 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
113 ft
1 main span
Daily traffic
15,266
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over Co.Rd Iowa String Road) is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over Co.Rd Iowa String Road) 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 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 15,266 vehicles a day, roughly 35% of them trucks, projected to reach 18,319 by 2043. The structure is 113 ft (34.3 m) long and 45 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesI-15 (SR-15) Sbl
CrossesCo.Rd Iowa String Road)
LocationI-15 I-84 Int.Tremonton
RouteInterstate 15
CountyBox Elder County
StateUtah
Coordinates41.69701, -112.18083
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
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 rating93.6 US tons
Inventory rating63.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length113 ft (34.3 m)
Longest span110 ft (33.5 m)
Deck width45 ft (13.7 m)
Roadway width41 ft (12.4 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 closed5 mi (8 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 Co.Rd Iowa String Road) built?

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

What condition is I-15 (SR-15) Sbl over Co.Rd Iowa String Road) 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 Co.Rd Iowa String Road) carry?

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

How long is I-15 (SR-15) Sbl over Co.Rd Iowa String Road)?

The structure is 113 ft (34.3 m) long with a longest span of 110 ft (33.5 m) and a deck 45 ft wide.

Who owns I-15 (SR-15) Sbl over Co.Rd Iowa String Road)?

It is owned by the State Highway Agency.