US Bridges

I-15 (SR-15)NB&SB over Kanarra Creek

Fair

Iron County, Utah · 3.5 Mi.N.New Harmony Int · Structure no. 0E1808

Built
1966
59 years old, rebuilt 1970
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
33,319
2022 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15)NB&SB over Kanarra Creek is a concrete continuous culvert carrying I-15 (SR-15)NB&SB over Kanarra Creek in Iron County, Utah. It was built in 1966 and reconstructed in 1970, so it is 59 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 33,319 vehicles a day, roughly 44% of them trucks, projected to reach 39,983 by 2042. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesI-15 (SR-15)NB&SB
CrossesKanarra Creek
Location3.5 Mi.N.New Harmony Int
RouteInterstate 15
CountyIron County
StateUtah
Coordinates37.53056, -113.20722
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating68.9 US tons
Inventory rating33.2 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deck99 ft (30.2 m)

Traffic and service

Average daily traffic33,319 (2022)
Projected traffic39,983 by 2042
Trucks44%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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)NB&SB over Kanarra Creek built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1970.

What condition is I-15 (SR-15)NB&SB over Kanarra 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)NB&SB over Kanarra Creek carry?

About 33,319 vehicles per day (2022 count), of which roughly 44% are trucks.

How long is I-15 (SR-15)NB&SB over Kanarra Creek?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m).

Who owns I-15 (SR-15)NB&SB over Kanarra Creek?

It is owned by the State Highway Agency.