US Bridges

I-15NB (SR-15) over American Fork Creek

Fair

Utah County, Utah · At 100 West 300 South · Structure no. 1F 811

Built
2011
14 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
73 ft
1 main span
Daily traffic
209,636
2017 count
Owner
State
State Highway Agency

About this bridge

I-15NB (SR-15) over American Fork Creek is a prestressed concrete stringer/multi-beam or girder carrying I-15NB (SR-15) over American Fork Creek in Utah County, Utah. It was built in 2011, so it is 14 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 209,636 vehicles a day, roughly 26% of them trucks, projected to reach 251,563 by 2037. The structure is 73 ft (22.2 m) long and 100 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-15NB (SR-15)
CrossesAmerican Fork Creek
LocationAt 100 West 300 South
RouteInterstate 15
CountyUtah County
StateUtah
Coordinates40.36839, -111.79712
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.7 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length73 ft (22.2 m)
Longest span67 ft (20.3 m)
Deck width100 ft (30.6 m)
Roadway width97 ft (29.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic209,636 (2017)
Projected traffic251,563 by 2037
Trucks26%
Lanes on structure6
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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-15NB (SR-15) over American Fork Creek built?

It was built in 2011, making it 14 years old in 2025.

What condition is I-15NB (SR-15) over American Fork Creek 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-15NB (SR-15) over American Fork Creek carry?

About 209,636 vehicles per day (2017 count), of which roughly 26% are trucks.

How long is I-15NB (SR-15) over American Fork Creek?

The structure is 73 ft (22.2 m) long with a longest span of 67 ft (20.3 m) and a deck 100 ft wide.

Who owns I-15NB (SR-15) over American Fork Creek?

It is owned by the State Highway Agency.