US Bridges

SR-274 Int. X-Road over I-15 (SR-15) Nbl & Sbl

Fair

Iron County, Utah · North Parowan Interchange · Structure no. 0C 538

Built
1973
52 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
263 ft
2 main spans
Daily traffic
1,460
2014 count
Owner
State
State Highway Agency

About this bridge

SR-274 Int. X-Road over I-15 (SR-15) Nbl & Sbl is a steel continuous stringer/multi-beam or girder carrying SR-274 Int. X-Road over I-15 (SR-15) Nbl & Sbl in Iron County, Utah. It was built in 1973, so it is 52 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 1,460 vehicles a day, roughly 28% of them trucks, projected to reach 1,825 by 2034. The structure is 263 ft (80.2 m) long and 54 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesSR-274 Int. X-Road
CrossesI-15 (SR-15) Nbl & Sbl
LocationNorth Parowan Interchange
RouteState Highway 274
CountyIron County
StateUtah
Coordinates37.85815, -112.82835
Functional classRural 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 evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating92.8 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length263 ft (80.2 m)
Longest span131 ft (39.9 m)
Deck width54 ft (16.5 m)
Roadway width51 ft (15.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,460 (2014)
Projected traffic1,825 by 2034
Trucks28%
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-274 Int. X-Road over I-15 (SR-15) Nbl & Sbl built?

It was built in 1973, making it 52 years old in 2025.

What condition is SR-274 Int. X-Road over I-15 (SR-15) Nbl & Sbl 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-274 Int. X-Road over I-15 (SR-15) Nbl & Sbl carry?

About 1,460 vehicles per day (2014 count), of which roughly 28% are trucks.

How long is SR-274 Int. X-Road over I-15 (SR-15) Nbl & Sbl?

The structure is 263 ft (80.2 m) long with a longest span of 131 ft (39.9 m) and a deck 54 ft wide.

Who owns SR-274 Int. X-Road over I-15 (SR-15) Nbl & Sbl?

It is owned by the State Highway Agency.