US Bridges

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

Good

Salt Lake County, Utah · 0.2 MI.SO.6400 South St. · Structure no. 3C 829S

Built
1999
26 years old, rebuilt 2019
Condition
Good
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
656 ft
3 main spans
Daily traffic
246,810
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over Union Pacific Railroad is a steel continuous stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over Union Pacific Railroad in Salt Lake County, Utah. It was built in 1999 and reconstructed in 2019, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 246,810 vehicles a day, roughly 27% of them trucks, projected to reach 308,513 by 2034. The structure is 656 ft (199.9 m) long and 107 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 (SR-15) Sbl
CrossesUnion Pacific Railroad
Location0.2 MI.SO.6400 South St.
RouteInterstate 15
CountySalt Lake County
StateUtah
Coordinates40.62986, -111.90369
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.6 US tons
Inventory rating57.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length656 ft (199.9 m)
Longest span269 ft (81.9 m)
Deck width107 ft (32.7 m)
Roadway width104 ft (31.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic246,810 (2014)
Projected traffic308,513 by 2034
Trucks27%
Lanes on structure7
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) Sbl over Union Pacific Railroad built?

It was built in 1999, making it 26 years old in 2025. It was reconstructed in 2019.

What condition is I-15 (SR-15) Sbl over Union Pacific Railroad in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2024.

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

The structure is 656 ft (199.9 m) long with a longest span of 269 ft (81.9 m) and a deck 107 ft wide.

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

It is owned by the State Highway Agency.