US Bridges

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

Fair

Weber County, Utah · Southeast of Roy · Structure no. 1F 80

Built
1966
59 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
211 ft
3 main spans
Daily traffic
138,457
2022 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Union Pacific Railroad is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over Union Pacific Railroad in Weber County, Utah. It was built in 1966, so it is 59 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 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 138,457 vehicles a day, roughly 33% of them trucks, projected to reach 166,148 by 2042. The structure is 211 ft (64.3 m) long and 82 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
LocationSoutheast of Roy
RouteInterstate 15
CountyWeber County
StateUtah
Coordinates41.15722, -112.02417
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 inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length211 ft (64.3 m)
Longest span62 ft (19 m)
Deck width82 ft (25 m)
Roadway width66 ft (20.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic138,457 (2022)
Projected traffic166,148 by 2042
Trucks33%
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 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 1966, making it 59 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 June 2023.

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

About 138,457 vehicles per day (2022 count), of which roughly 33% are trucks.

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

The structure is 211 ft (64.3 m) long with a longest span of 62 ft (19 m) and a deck 82 ft wide.

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

It is owned by the State Highway Agency.