US Bridges

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

Fair

Salt Lake County, Utah · 0.2 MI.SO.6400 South St. · Structure no. 1C 829N

Built
2000
25 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
569 ft
3 main spans
Daily traffic
246,810
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Union Pacific Railroad is a steel 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 2000, so it is 25 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 246,810 vehicles a day, roughly 27% of them trucks, projected to reach 308,513 by 2034. The structure is 569 ft (173.4 m) long and 85 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
Location0.2 MI.SO.6400 South St.
RouteInterstate 15
CountySalt Lake County
StateUtah
Coordinates40.62851, -111.90321
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 rating78.6 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length569 ft (173.4 m)
Longest span197 ft (60 m)
Deck width85 ft (25.9 m)
Roadway width82 ft (25.1 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic246,810 (2014)
Projected traffic308,513 by 2034
Trucks27%
Lanes on structure5
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 2000, making it 25 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 246,810 vehicles per day (2014 count), of which roughly 27% are trucks.

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

The structure is 569 ft (173.4 m) long with a longest span of 197 ft (60 m) and a deck 85 ft wide.

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

It is owned by the State Highway Agency.