US Bridges

I-15 (SR-15) Nbl over City St. & Int. X-Ro

Fair

Iron County, Utah · South Cedar City Intchg. · Structure no. 1F 181

Built
1967
58 years old, rebuilt 2014
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
24,835
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over City St. & Int. X-Ro is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over City St. & Int. X-Ro in Iron County, Utah. It was built in 1967 and reconstructed in 2014, 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 24,835 vehicles a day, roughly 44% of them trucks, projected to reach 31,044 by 2034. The structure is 87 ft (26.5 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 (SR-15) Nbl
CrossesCity St. & Int. X-Ro
LocationSouth Cedar City Intchg.
RouteInterstate 15
CountyIron County
StateUtah
Coordinates37.65417, -113.08222
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length87 ft (26.5 m)
Longest span83 ft (25.4 m)
Deck width40 ft (12.1 m)
Roadway width36 ft (11.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,835 (2014)
Projected traffic31,044 by 2034
Trucks44%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
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) Nbl over City St. & Int. X-Ro built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2014.

What condition is I-15 (SR-15) Nbl over City St. & Int. X-Ro 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 I-15 (SR-15) Nbl over City St. & Int. X-Ro carry?

About 24,835 vehicles per day (2014 count), of which roughly 44% are trucks.

How long is I-15 (SR-15) Nbl over City St. & Int. X-Ro?

The structure is 87 ft (26.5 m) long with a longest span of 83 ft (25.4 m) and a deck 40 ft wide.

Who owns I-15 (SR-15) Nbl over City St. & Int. X-Ro?

It is owned by the State Highway Agency.