US Bridges

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

Fair

Juab County, Utah · Mona Interchange · Structure no. 3C 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) Sbl over SR-54 Intchg. X-Road is a steel continuous stringer/multi-beam or girder carrying I-15 (SR-15) Sbl 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 5 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 45 ft wide.

Location

Open in Google Maps
CarriesI-15 (SR-15) Sbl
CrossesSR-54 Intchg. X-Road
LocationMona Interchange
RouteInterstate 15
CountyJuab County
StateUtah
Coordinates39.82167, -111.83361
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural 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 width45 ft (13.6 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) Sbl 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) Sbl 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) Sbl 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) Sbl 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 45 ft wide.

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

It is owned by the State Highway Agency.