US Bridges

I-15 (SR-15) Nbl over Santaquin Canyon Road

Fair

Utah County, Utah · Sw.Side of Santaquin · Structure no. 1C 763

Built
1989
36 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
94 ft
1 main span
Daily traffic
21,260
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Santaquin Canyon Road is a steel stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over Santaquin Canyon Road in Utah County, Utah. It was built in 1989, so it is 36 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 21,260 vehicles a day, roughly 26% of them trucks, projected to reach 26,575 by 2034. The structure is 94 ft (28.5 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 (SR-15) Nbl
CrossesSantaquin Canyon Road
LocationSw.Side of Santaquin
RouteInterstate 15
CountyUtah County
StateUtah
Coordinates39.96556, -111.78528
Functional classUrban 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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating60.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length94 ft (28.5 m)
Longest span90 ft (27.4 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,260 (2014)
Projected traffic26,575 by 2034
Trucks26%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 Santaquin Canyon Road built?

It was built in 1989, making it 36 years old in 2025.

What condition is I-15 (SR-15) Nbl over Santaquin Canyon 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) Nbl over Santaquin Canyon Road carry?

About 21,260 vehicles per day (2014 count), of which roughly 26% are trucks.

How long is I-15 (SR-15) Nbl over Santaquin Canyon Road?

The structure is 94 ft (28.5 m) long with a longest span of 90 ft (27.4 m) and a deck 45 ft wide.

Who owns I-15 (SR-15) Nbl over Santaquin Canyon Road?

It is owned by the State Highway Agency.