US Bridges

I-15 (SR-15) Sbl over Deer Crossing

Fair

Millard County, Utah · 1 Mile South of Scipio · Structure no. 3C 643

Built
1978
47 years old, rebuilt 2012
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
75 ft
3 main spans
Daily traffic
14,385
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over Deer Crossing is a steel continuous stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over Deer Crossing in Millard County, Utah. It was built in 1978 and reconstructed in 2012, so it is 47 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 14,385 vehicles a day, roughly 42% of them trucks, projected to reach 17,982 by 2034. The structure is 75 ft (22.9 m) long and 63 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-15 (SR-15) Sbl
CrossesDeer Crossing
Location1 Mile South of Scipio
RouteInterstate 15
CountyMillard County
StateUtah
Coordinates39.21891, -112.15566
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 rating85.8 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span30 ft (9.1 m)
Deck width63 ft (19.1 m)
Roadway width60 ft (18.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,385 (2014)
Projected traffic17,982 by 2034
Trucks42%
Lanes on structure3
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 (SR-15) Sbl over Deer Crossing built?

It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2012.

What condition is I-15 (SR-15) Sbl 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 February 2023.

How much traffic does I-15 (SR-15) Sbl over Deer Crossing carry?

About 14,385 vehicles per day (2014 count), of which roughly 42% are trucks.

How long is I-15 (SR-15) Sbl over Deer Crossing?

The structure is 75 ft (22.9 m) long with a longest span of 30 ft (9.1 m) and a deck 63 ft wide.

Who owns I-15 (SR-15) Sbl over Deer Crossing?

It is owned by the State Highway Agency.