US Bridges

I-15 (SR-15) Nbl over Co. Rd. to Nucor & SR-13

Good

Box Elder County, Utah · Plymouth Interchange · Structure no. 1F 483

Built
1989
36 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
142 ft
1 main span
Daily traffic
12,747
2021 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Co. Rd. to Nucor & SR-13 is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over Co. Rd. to Nucor & SR-13 in Box Elder County, Utah. It was built in 1989, so it is 36 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 12,747 vehicles a day, roughly 41% of them trucks, projected to reach 15,296 by 2041. The structure is 142 ft (43.4 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI-15 (SR-15) Nbl
CrossesCo. Rd. to Nucor & SR-13
LocationPlymouth Interchange
RouteInterstate 15
CountyBox Elder County
StateUtah
Coordinates41.8862, -112.17025
Functional classRural 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating60 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length142 ft (43.4 m)
Longest span140 ft (42.7 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,747 (2021)
Projected traffic15,296 by 2041
Trucks41%
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 Co. Rd. to Nucor & SR-13 built?

It was built in 1989, making it 36 years old in 2025.

What condition is I-15 (SR-15) Nbl over Co. Rd. to Nucor & SR-13 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 April 2023.

How much traffic does I-15 (SR-15) Nbl over Co. Rd. to Nucor & SR-13 carry?

About 12,747 vehicles per day (2021 count), of which roughly 41% are trucks.

How long is I-15 (SR-15) Nbl over Co. Rd. to Nucor & SR-13?

The structure is 142 ft (43.4 m) long with a longest span of 140 ft (42.7 m) and a deck 44 ft wide.

Who owns I-15 (SR-15) Nbl over Co. Rd. to Nucor & SR-13?

It is owned by the State Highway Agency.