US Bridges

County Rd.Int.X-Rd over I-15 (SR-15) Nbl & S

Fair

Iron County, Utah · Fremont Interchange · Structure no. 0F 471

Built
1984
41 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
269 ft
2 main spans
Daily traffic
21
2017 count
Owner
State
State Highway Agency

About this bridge

County Rd.Int.X-Rd over I-15 (SR-15) Nbl & S is a prestressed concrete continuous stringer/multi-beam or girder carrying County Rd.Int.X-Rd over I-15 (SR-15) Nbl & S in Iron County, Utah. It was built in 1984, so it is 41 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 21 vehicles a day, roughly 25% of them trucks, projected to reach 25 by 2037. The structure is 269 ft (82.1 m) long and 34 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesCounty Rd.Int.X-Rd
CrossesI-15 (SR-15) Nbl & S
LocationFremont Interchange
RouteState Highway 15
CountyIron County
StateUtah
Coordinates38.13028, -112.62722
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating97.1 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length269 ft (82.1 m)
Longest span138 ft (42 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21 (2017)
Projected traffic25 by 2037
Trucks25%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes

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 County Rd.Int.X-Rd over I-15 (SR-15) Nbl & S built?

It was built in 1984, making it 41 years old in 2025.

What condition is County Rd.Int.X-Rd 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 February 2023.

How much traffic does County Rd.Int.X-Rd over I-15 (SR-15) Nbl & S carry?

About 21 vehicles per day (2017 count), of which roughly 25% are trucks.

How long is County Rd.Int.X-Rd over I-15 (SR-15) Nbl & S?

The structure is 269 ft (82.1 m) long with a longest span of 138 ft (42 m) and a deck 34 ft wide.

Who owns County Rd.Int.X-Rd over I-15 (SR-15) Nbl & S?

It is owned by the State Highway Agency.