US Bridges

I-84 (SR-84) over Farm Road Underpass

Fair

Box Elder County, Utah · 19 Mi. North of Tremonton · Structure no. 0E1129

Built
1959
66 years old, rebuilt 1973
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
29 ft
1 main span
Daily traffic
12,370
2022 count
Owner
State
State Highway Agency

About this bridge

I-84 (SR-84) over Farm Road Underpass is a concrete culvert carrying I-84 (SR-84) over Farm Road Underpass in Box Elder County, Utah. It was built in 1959 and reconstructed in 1973, so it is 66 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 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 12,370 vehicles a day, roughly 53% of them trucks, projected to reach 14,844 by 2042. The structure is 29 ft (8.9 m) long. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesI-84 (SR-84)
CrossesFarm Road Underpass
Location19 Mi. North of Tremonton
RouteInterstate 84
CountyBox Elder County
StateUtah
Coordinates41.87306, -112.46611
Functional classRural 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
Culvert6 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
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating71.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20 + Mod
Structure length29 ft (8.9 m)
Longest span27 ft (8.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,370 (2022)
Projected traffic14,844 by 2042
Trucks53%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed123.7 mi (199 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-84 (SR-84) over Farm Road Underpass built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1973.

What condition is I-84 (SR-84) over Farm Road Underpass 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-84 (SR-84) over Farm Road Underpass carry?

About 12,370 vehicles per day (2022 count), of which roughly 53% are trucks.

How long is I-84 (SR-84) over Farm Road Underpass?

The structure is 29 ft (8.9 m) long with a longest span of 27 ft (8.2 m).

Who owns I-84 (SR-84) over Farm Road Underpass?

It is owned by the State Highway Agency.