US Bridges

I-15 (SR-15) Nbl over Union Pacific Railroad

Fair

Juab County, Utah · So.Of South Nephi Intchg. · Structure no. 1F 449

Built
1984
41 years old, rebuilt 2006
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
225 ft
3 main spans
Daily traffic
13,275
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Union Pacific Railroad is a prestressed concrete continuous stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over Union Pacific Railroad in Juab County, Utah. It was built in 1984 and reconstructed in 2006, so it is 41 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 13,275 vehicles a day, roughly 32% of them trucks, projected to reach 16,594 by 2034. The structure is 225 ft (68.5 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 (SR-15) Nbl
CrossesUnion Pacific Railroad
LocationSo.Of South Nephi Intchg.
RouteInterstate 15
CountyJuab County
StateUtah
Coordinates39.67941, -111.84253
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length225 ft (68.5 m)
Longest span97 ft (29.6 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic13,275 (2014)
Projected traffic16,594 by 2034
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 (SR-15) Nbl over Union Pacific Railroad built?

It was built in 1984, making it 41 years old in 2025. It was reconstructed in 2006.

What condition is I-15 (SR-15) Nbl 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 (SR-15) Nbl over Union Pacific Railroad carry?

About 13,275 vehicles per day (2014 count), of which roughly 32% are trucks.

How long is I-15 (SR-15) Nbl over Union Pacific Railroad?

The structure is 225 ft (68.5 m) long with a longest span of 97 ft (29.6 m) and a deck 44 ft wide.

Who owns I-15 (SR-15) Nbl over Union Pacific Railroad?

It is owned by the State Highway Agency.