US Bridges

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

Fair

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

Built
1978
47 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
75 ft
3 main spans
Daily traffic
19,660
2022 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Deer Crossing is a steel continuous stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over Deer Crossing in Millard County, Utah. It was built in 1978, 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 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 19,660 vehicles a day, roughly 33% of them trucks, projected to reach 23,592 by 2042. The structure is 75 ft (22.9 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-15 (SR-15) Nbl
CrossesDeer Crossing
Location1 Mile South of Scipio
RouteInterstate 15
CountyMillard County
StateUtah
Coordinates39.21848, -112.15524
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating92.5 US tons
Inventory rating51 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 width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,660 (2022)
Projected traffic23,592 by 2042
Trucks33%
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 (SR-15) Nbl over Deer Crossing built?

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

What condition is I-15 (SR-15) Nbl 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) Nbl over Deer Crossing carry?

About 19,660 vehicles per day (2022 count), of which roughly 33% are trucks.

How long is I-15 (SR-15) Nbl 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 44 ft wide.

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

It is owned by the State Highway Agency.