US Bridges

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

Fair

Box Elder County, Utah · Plymouth Interchange · Structure no. 3F 483

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

About this bridge

I-15 (SR-15) Sbl over Co. Rd. to Nucor & SR-13 is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Sbl 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 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 41% of them trucks, projected to reach 15,296 by 2043. The structure is 142 ft (43.4 m) long and 44 ft wide.

Location

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CarriesI-15 (SR-15) Sbl
CrossesCo. Rd. to Nucor & SR-13
LocationPlymouth Interchange
RouteInterstate 15
CountyBox Elder County
StateUtah
Coordinates41.88673, -112.17051
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
Deck7 GoodSome minor problems.
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 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 (2023)
Projected traffic15,296 by 2043
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) Sbl 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) Sbl over Co. Rd. to Nucor & SR-13 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) Sbl over Co. Rd. to Nucor & SR-13 carry?

About 12,747 vehicles per day (2023 count), of which roughly 41% are trucks.

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

It is owned by the State Highway Agency.