US Bridges

SR-178 800 S. Int. over I-15 (SR-15) Nbl & S

Fair

Utah County, Utah · South Payson Interchange · Structure no. 0C 504

Built
1967
58 years old, rebuilt 1978
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
242 ft
2 main spans
Daily traffic
13,525
2022 count
Owner
State
State Highway Agency

About this bridge

SR-178 800 S. Int. over I-15 (SR-15) Nbl & S is a steel continuous stringer/multi-beam or girder carrying SR-178 800 S. Int. over I-15 (SR-15) Nbl & S in Utah County, Utah. It was built in 1967 and reconstructed in 1978, 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 13,525 vehicles a day, roughly 25% of them trucks, projected to reach 16,230 by 2042. The structure is 242 ft (73.7 m) long and 56 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesSR-178 800 S. Int.
CrossesI-15 (SR-15) Nbl & S
LocationSouth Payson Interchange
RouteState Highway 178
CountyUtah County
StateUtah
Coordinates40.03142, -111.75766
Functional classUrban Minor Arterial

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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42.9 US tons
Inventory rating26.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length242 ft (73.7 m)
Longest span118 ft (36 m)
Deck width56 ft (17.1 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,525 (2022)
Projected traffic16,230 by 2042
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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 SR-178 800 S. Int. over I-15 (SR-15) Nbl & S built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 1978.

What condition is SR-178 800 S. Int. over I-15 (SR-15) Nbl & S 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 SR-178 800 S. Int. over I-15 (SR-15) Nbl & S carry?

About 13,525 vehicles per day (2022 count), of which roughly 25% are trucks.

How long is SR-178 800 S. Int. over I-15 (SR-15) Nbl & S?

The structure is 242 ft (73.7 m) long with a longest span of 118 ft (36 m) and a deck 56 ft wide.

Who owns SR-178 800 S. Int. over I-15 (SR-15) Nbl & S?

It is owned by the State Highway Agency.