US Bridges

I-15 (SR-15) over Farm Road Underpass

Good

Box Elder County, Utah · 2.5 Mi.No.Riverside Int. · Structure no. 0V1650

Built
1989
36 years old
Condition
Good
inspected April 2023
Type
Culvert
Steel
Length
24 ft
1 main span
Daily traffic
13,856
2022 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) over Farm Road Underpass is a steel culvert carrying I-15 (SR-15) over Farm Road Underpass in Box Elder County, Utah. It was built in 1989, so it is 36 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 13,856 vehicles a day, roughly 41% of them trucks, projected to reach 16,627 by 2042. The structure is 24 ft (7.4 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-15 (SR-15)
CrossesFarm Road Underpass
Location2.5 Mi.No.Riverside Int.
RouteInterstate 15
CountyBox Elder County
StateUtah
Coordinates41.81972, -112.17972
Functional classRural 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
Culvert7 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
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating106.5 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20 + Mod
Structure length24 ft (7.4 m)
Longest span24 ft (7.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,856 (2022)
Projected traffic16,627 by 2042
Trucks41%
Lanes on structure4
Traffic directionTwo-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) over Farm Road Underpass built?

It was built in 1989, making it 36 years old in 2025.

What condition is I-15 (SR-15) over Farm Road Underpass 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) over Farm Road Underpass carry?

About 13,856 vehicles per day (2022 count), of which roughly 41% are trucks.

How long is I-15 (SR-15) over Farm Road Underpass?

The structure is 24 ft (7.4 m) long with a longest span of 24 ft (7.4 m).

Who owns I-15 (SR-15) over Farm Road Underpass?

It is owned by the State Highway Agency.