US Bridges

I-15 SB over Union Pacific Railroad

Fair

Juab County, Utah · North of SR-78 Intchg · Structure no. 3F 406

Built
1985
40 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
191 ft
3 main spans
Daily traffic
34,167
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 SB over Union Pacific Railroad is a prestressed concrete continuous stringer/multi-beam or girder carrying I-15 SB over Union Pacific Railroad in Juab County, Utah. It was built in 1985, so it is 40 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 34,167 vehicles a day, roughly 32% of them trucks, projected to reach 41,000 by 2043. The structure is 191 ft (58.1 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 SB
CrossesUnion Pacific Railroad
LocationNorth of SR-78 Intchg
RouteInterstate 15
CountyJuab County
StateUtah
Coordinates39.48778, -111.97444
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 rating60.7 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length191 ft (58.1 m)
Longest span71 ft (21.7 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34,167 (2023)
Projected traffic41,000 by 2043
Trucks32%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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 SB over Union Pacific Railroad built?

It was built in 1985, making it 40 years old in 2025.

What condition is I-15 SB over Union Pacific Railroad 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 March 2023.

How much traffic does I-15 SB over Union Pacific Railroad carry?

About 34,167 vehicles per day (2023 count), of which roughly 32% are trucks.

How long is I-15 SB over Union Pacific Railroad?

The structure is 191 ft (58.1 m) long with a longest span of 71 ft (21.7 m) and a deck 44 ft wide.

Who owns I-15 SB over Union Pacific Railroad?

It is owned by the State Highway Agency.