US Bridges

SR-271 Int. X-Road over I-15 (SR-15) Nbl & Sbl

Fair

Iron County, Utah · Paragonah Interchange · Structure no. 0C 539

Built
1975
50 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
285 ft
2 main spans
Daily traffic
175
2014 count
Owner
State
State Highway Agency

About this bridge

SR-271 Int. X-Road over I-15 (SR-15) Nbl & Sbl is a steel continuous stringer/multi-beam or girder carrying SR-271 Int. X-Road over I-15 (SR-15) Nbl & Sbl in Iron County, Utah. It was built in 1975, so it is 50 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 175 vehicles a day, roughly 30% of them trucks, projected to reach 219 by 2034. The structure is 285 ft (87 m) long and 34 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesSR-271 Int. X-Road
CrossesI-15 (SR-15) Nbl & Sbl
LocationParagonah Interchange
RouteState Highway 271
CountyIron County
StateUtah
Coordinates37.90857, -112.77687
Functional classRural Major Collector

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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating39.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length285 ft (87 m)
Longest span141 ft (43.1 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic175 (2014)
Projected traffic219 by 2034
Trucks30%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed8.1 mi (13 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-271 Int. X-Road over I-15 (SR-15) Nbl & Sbl built?

It was built in 1975, making it 50 years old in 2025.

What condition is SR-271 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-271 Int. X-Road over I-15 (SR-15) Nbl & Sbl carry?

About 175 vehicles per day (2014 count), of which roughly 30% are trucks.

How long is SR-271 Int. X-Road over I-15 (SR-15) Nbl & Sbl?

The structure is 285 ft (87 m) long with a longest span of 141 ft (43.1 m) and a deck 34 ft wide.

Who owns SR-271 Int. X-Road over I-15 (SR-15) Nbl & Sbl?

It is owned by the State Highway Agency.