US Bridges

I-15 (SR-15) Nbl over SR-147

Fair

Utah County, Utah · West Side of Payson · Structure no. 1F 129

Built
1967
58 years old, rebuilt 2014
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
142 ft
3 main spans
Daily traffic
37,030
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over SR-147 is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over SR-147 in Utah County, Utah. It was built in 1967 and reconstructed in 2014, so it is 58 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 37,030 vehicles a day, roughly 26% of them trucks, projected to reach 46,288 by 2034. The structure is 142 ft (43.2 m) long and 61 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
CrossesSR-147
LocationWest Side of Payson
RouteInterstate 15
CountyUtah County
StateUtah
Coordinates40.04333, -111.745
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 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 rating35.7 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length142 ft (43.2 m)
Longest span61 ft (18.7 m)
Deck width61 ft (18.5 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,030 (2014)
Projected traffic46,288 by 2034
Trucks26%
Lanes on structure3
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 SR-147 built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2014.

What condition is I-15 (SR-15) Nbl over SR-147 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 SR-147 carry?

About 37,030 vehicles per day (2014 count), of which roughly 26% are trucks.

How long is I-15 (SR-15) Nbl over SR-147?

The structure is 142 ft (43.2 m) long with a longest span of 61 ft (18.7 m) and a deck 61 ft wide.

Who owns I-15 (SR-15) Nbl over SR-147?

It is owned by the State Highway Agency.