US Bridges

I-15 NB over Kolob Canyon RD

Fair

Washington County, Utah · I-15 NB over Kolob Cyn RD · Structure no. 1C1054

Built
2020
5 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
89 ft
1 main span
Daily traffic
29,000
2019 count
Owner
State
State Highway Agency

About this bridge

I-15 NB over Kolob Canyon RD is a steel stringer/multi-beam or girder carrying I-15 NB over Kolob Canyon RD in Washington County, Utah. It was built in 2020, so it is 5 years old, younger 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 29,000 vehicles a day, roughly 32% of them trucks, projected to reach 36,250 by 2039. The structure is 89 ft (27.1 m) long and 65 ft wide.

Location

Open in Google Maps
CarriesI-15 NB
CrossesKolob Canyon RD
LocationI-15 NB over Kolob Cyn RD
RouteInterstate 15
CountyWashington County
StateUtah
Coordinates37.4544, -113.2278
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length89 ft (27.1 m)
Longest span85 ft (25.9 m)
Deck width65 ft (19.8 m)
Roadway width62 ft (18.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic29,000 (2019)
Projected traffic36,250 by 2039
Trucks32%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo
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 NB over Kolob Canyon RD built?

It was built in 2020, making it 5 years old in 2025.

What condition is I-15 NB over Kolob Canyon RD 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 January 2025.

How much traffic does I-15 NB over Kolob Canyon RD carry?

About 29,000 vehicles per day (2019 count), of which roughly 32% are trucks.

How long is I-15 NB over Kolob Canyon RD?

The structure is 89 ft (27.1 m) long with a longest span of 85 ft (25.9 m) and a deck 65 ft wide.

Who owns I-15 NB over Kolob Canyon RD?

It is owned by the State Highway Agency.