US Bridges

I-15 (SR-15) Sbl over New Harmony Rd. Int.X-Rd

Fair

Washington County, Utah · New Harmony Interchange · Structure no. 3D 632

Built
1959
66 years old
Condition
Fair
inspected January 2025
Type
Tee Beam
Concrete Continuous
Length
120 ft
3 main spans
Daily traffic
22,855
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over New Harmony Rd. Int.X-Rd is a concrete continuous tee beam carrying I-15 (SR-15) Sbl over New Harmony Rd. Int.X-Rd in Washington County, Utah. It was built in 1959, so it is 66 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 5 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 22,855 vehicles a day, roughly 43% of them trucks, projected to reach 28,569 by 2034. The structure is 120 ft (36.6 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI-15 (SR-15) Sbl
CrossesNew Harmony Rd. Int.X-Rd
LocationNew Harmony Interchange
RouteInterstate 15
CountyWashington County
StateUtah
Coordinates37.4819, -113.22101
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
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 rating46.4 US tons
Inventory rating25 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length120 ft (36.6 m)
Longest span45 ft (13.7 m)
Deck width44 ft (13.5 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,855 (2014)
Projected traffic28,569 by 2034
Trucks43%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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) Sbl over New Harmony Rd. Int.X-Rd built?

It was built in 1959, making it 66 years old in 2025.

What condition is I-15 (SR-15) Sbl over New Harmony Rd. Int.X-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 (SR-15) Sbl over New Harmony Rd. Int.X-Rd carry?

About 22,855 vehicles per day (2014 count), of which roughly 43% are trucks.

How long is I-15 (SR-15) Sbl over New Harmony Rd. Int.X-Rd?

The structure is 120 ft (36.6 m) long with a longest span of 45 ft (13.7 m) and a deck 44 ft wide.

Who owns I-15 (SR-15) Sbl over New Harmony Rd. Int.X-Rd?

It is owned by the State Highway Agency.