US Bridges

I-15 SB over Deer Crossing

Fair

Juab County, Utah · 2 Mi.So.Mona Interchange · Structure no. 3C 610

Built
1974
51 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
86 ft
3 main spans
Daily traffic
43,829
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 SB over Deer Crossing is a steel continuous stringer/multi-beam or girder carrying I-15 SB over Deer Crossing 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 43,829 vehicles a day, roughly 26% of them trucks, projected to reach 52,595 by 2043. The structure is 86 ft (26.2 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-15 SB
CrossesDeer Crossing
Location2 Mi.So.Mona Interchange
RouteInterstate 15
CountyJuab County
StateUtah
Coordinates39.79278, -111.83889
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 23 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 rating42.9 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length86 ft (26.2 m)
Longest span35 ft (10.8 m)
Deck width45 ft (13.6 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic43,829 (2023)
Projected traffic52,595 by 2043
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed1.2 mi (2 km)
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 SB over Deer Crossing built?

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

What condition is I-15 SB over Deer Crossing 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 SB over Deer Crossing carry?

About 43,829 vehicles per day (2023 count), of which roughly 26% are trucks.

How long is I-15 SB over Deer Crossing?

The structure is 86 ft (26.2 m) long with a longest span of 35 ft (10.8 m) and a deck 45 ft wide.

Who owns I-15 SB over Deer Crossing?

It is owned by the State Highway Agency.