US Bridges

I-15 (SR-15) Sbl over City St. to No. Fields

Fair

Iron County, Utah · 2.2 MI No Cedar City Int. · Structure no. 3D 788

Built
1968
57 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
83 ft
3 main spans
Daily traffic
24,335
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over City St. to No. Fields is a concrete continuous slab carrying I-15 (SR-15) Sbl over City St. to No. Fields in Iron County, Utah. It was built in 1968, 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 83 ft (25.4 m) long and 41 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
CrossesCity St. to No. Fields
Location2.2 MI No Cedar City Int.
RouteInterstate 15
CountyIron County
StateUtah
Coordinates37.71194, -113.06806
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating42.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length83 ft (25.4 m)
Longest span34 ft (10.5 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic24,335 (2014)
Projected traffic30,419 by 2034
Trucks44%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
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) Sbl over City St. to No. Fields built?

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

What condition is I-15 (SR-15) Sbl over City St. to No. Fields 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 City St. to No. Fields carry?

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

How long is I-15 (SR-15) Sbl over City St. to No. Fields?

The structure is 83 ft (25.4 m) long with a longest span of 34 ft (10.5 m) and a deck 41 ft wide.

Who owns I-15 (SR-15) Sbl over City St. to No. Fields?

It is owned by the State Highway Agency.