US Bridges

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

Fair

Salt Lake County, Utah · Approx. 300 W.3400 South · Structure no. 1F 618N

Built
1999
26 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
314 ft
3 main spans
Daily traffic
218,515
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 Salt Lake County, Utah. It was built in 1999, so it is 26 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 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 218,515 vehicles a day, roughly 24% of them trucks, projected to reach 273,144 by 2034. The structure is 314 ft (95.6 m) long and 101 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
LocationApprox. 300 W.3400 South
RouteInterstate 15
CountySalt Lake County
StateUtah
Coordinates40.69352, -111.90238
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
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 rating46.4 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length314 ft (95.6 m)
Longest span126 ft (38.3 m)
Deck width101 ft (30.8 m)
Roadway width94 ft (28.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic218,515 (2014)
Projected traffic273,144 by 2034
Trucks24%
Lanes on structure6
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 1999, making it 26 years old in 2025.

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 October 2024.

How much traffic does I-15 (SR-15) Nbl over Union Pacific Railroad carry?

About 218,515 vehicles per day (2014 count), of which roughly 24% are trucks.

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

The structure is 314 ft (95.6 m) long with a longest span of 126 ft (38.3 m) and a deck 101 ft wide.

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

It is owned by the State Highway Agency.