US Bridges

I-15 (SR-15) Nbl over Portage Intchg.X-Road

Fair

Box Elder County, Utah · Portage Interchange · Structure no. 1F 373

Built
1976
49 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
104 ft
1 main span
Daily traffic
12,747
2021 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Portage Intchg.X-Road is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over Portage Intchg.X-Road in Box Elder County, Utah. It was built in 1976, so it is 49 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 12,747 vehicles a day, roughly 39% of them trucks, projected to reach 15,296 by 2041. The structure is 104 ft (31.8 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI-15 (SR-15) Nbl
CrossesPortage Intchg.X-Road
LocationPortage Interchange
RouteInterstate 15
CountyBox Elder County
StateUtah
Coordinates41.97666, -112.18938
Functional classRural 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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
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 rating74.3 US tons
Inventory rating45.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length104 ft (31.8 m)
Longest span101 ft (30.9 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,747 (2021)
Projected traffic15,296 by 2041
Trucks39%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 Portage Intchg.X-Road built?

It was built in 1976, making it 49 years old in 2025.

What condition is I-15 (SR-15) Nbl over Portage Intchg.X-Road 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 April 2023.

How much traffic does I-15 (SR-15) Nbl over Portage Intchg.X-Road carry?

About 12,747 vehicles per day (2021 count), of which roughly 39% are trucks.

How long is I-15 (SR-15) Nbl over Portage Intchg.X-Road?

The structure is 104 ft (31.8 m) long with a longest span of 101 ft (30.9 m) and a deck 44 ft wide.

Who owns I-15 (SR-15) Nbl over Portage Intchg.X-Road?

It is owned by the State Highway Agency.