I-15 (SR-15) Nbl over SR-54 Intchg. X-Road

Fair

Juab County, Utah · Mona Interchange · Structure no. 1C 607

Built: 1974; 51 years old
Condition: Fair; inspected March 2023
Type: Stringer/Multi-beam or Girder; Steel Continuous
Length: 115 ft; 3 main spans
Daily traffic: 19,920; 2014 count
Owner: State; State Highway Agency

About this bridge

I-15 (SR-15) Nbl over SR-54 Intchg. X-Road is a steel continuous stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over SR-54 Intchg. X-Road in Juab County, Utah. It was built in 1974, so it is 51 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 19,920 vehicles a day, roughly 26% of them trucks, projected to reach 24,900 by 2034. The structure is 115 ft (34.9 m) long and 44 ft wide.

Location

No coordinates are recorded for this structure.

CarriesI-15 (SR-15) Nbl

CrossesSR-54 Intchg. X-Road

LocationMona Interchange

RouteInterstate 15

CountyJuab County

StateUtah

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.

Component	Rating	Meaning
Deck	6 Satisfactory	Structural elements show some minor deterioration.
Superstructure	6 Satisfactory	Structural elements show some minor deterioration.
Substructure	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionMarch 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 rating39.2 US tons

Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder

MaterialSteel Continuous

DeckConcrete, cast-in-place

Main spans3

Design loadHS 20 + Mod

Structure length115 ft (34.9 m)

Longest span51 ft (15.5 m)

Deck width44 ft (13.5 m)

Roadway width41 ft (12.4 m)

Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,920 (2014)

Projected traffic24,900 by 2034

Trucks26%

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 SR-54 Intchg. X-Road built?

It was built in 1974, making it 51 years old in 2025.

What condition is I-15 (SR-15) Nbl over SR-54 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 March 2023.

How much traffic does I-15 (SR-15) Nbl over SR-54 Intchg. X-Road carry?

About 19,920 vehicles per day (2014 count), of which roughly 26% are trucks.

How long is I-15 (SR-15) Nbl over SR-54 Intchg. X-Road?

The structure is 115 ft (34.9 m) long with a longest span of 51 ft (15.5 m) and a deck 44 ft wide.

Who owns I-15 (SR-15) Nbl over SR-54 Intchg. X-Road?

It is owned by the State Highway Agency.