US Bridges

I-15 (SR-15) Sbl over Coal Creek

Fair

Iron County, Utah · 1.1 Mi.No.Cedar City Int. · Structure no. 3F 120

Built
1968
57 years old, rebuilt 1993
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
130 ft
2 main spans
Daily traffic
24,335
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over Coal Creek is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over Coal Creek in Iron County, Utah. It was built in 1968 and reconstructed in 1993, so it is 57 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 24,335 vehicles a day, roughly 44% of them trucks, projected to reach 30,419 by 2034. The structure is 130 ft (39.7 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) Sbl
CrossesCoal Creek
Location1.1 Mi.No.Cedar City Int.
RouteInterstate 15
CountyIron County
StateUtah
Coordinates37.6975, -113.07639
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.2 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length130 ft (39.7 m)
Longest span63 ft (19.1 m)
Deck width40 ft (12.2 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,335 (2014)
Projected traffic30,419 by 2034
Trucks44%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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) Sbl over Coal Creek built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1993.

What condition is I-15 (SR-15) Sbl over Coal Creek 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) Sbl over Coal Creek carry?

About 24,335 vehicles per day (2014 count), of which roughly 44% are trucks.

How long is I-15 (SR-15) Sbl over Coal Creek?

The structure is 130 ft (39.7 m) long with a longest span of 63 ft (19.1 m) and a deck 40 ft wide.

Who owns I-15 (SR-15) Sbl over Coal Creek?

It is owned by the State Highway Agency.