US Bridges

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

Good

Weber County, Utah · So. of 12th St. Intchg. · Structure no. 1F 745

Built
2008
17 years old
Condition
Good
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
131 ft
1 main span
Daily traffic
94,016
2022 count
Owner
State
State Highway Agency

About this bridge

I-15NB (SR-15) over Union Pacific Railroad is a prestressed concrete stringer/multi-beam or girder carrying I-15NB (SR-15) over Union Pacific Railroad in Weber County, Utah. It was built in 2008, so it is 17 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 94,016 vehicles a day, roughly 34% of them trucks, projected to reach 112,819 by 2042. The structure is 131 ft (39.8 m) long and 65 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-15NB (SR-15)
CrossesUnion Pacific Railroad
LocationSo. of 12th St. Intchg.
RouteInterstate 15
CountyWeber County
StateUtah
Coordinates41.2423, -112.01521
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.4 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length131 ft (39.8 m)
Longest span127 ft (38.8 m)
Deck width65 ft (19.8 m)
Roadway width62 ft (19 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic94,016 (2022)
Projected traffic112,819 by 2042
Trucks34%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

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-15NB (SR-15) over Union Pacific Railroad built?

It was built in 2008, making it 17 years old in 2025.

What condition is I-15NB (SR-15) 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 August 2023.

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

About 94,016 vehicles per day (2022 count), of which roughly 34% are trucks.

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

The structure is 131 ft (39.8 m) long with a longest span of 127 ft (38.8 m) and a deck 65 ft wide.

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

It is owned by the State Highway Agency.