US Bridges

I-15 (SR-15)NB&AMP over South Ash Creek

Fair

Washington County, Utah · 3.6 Mi.No.Anderson R.Int. · Structure no. 0D 627

Built
1959
66 years old, rebuilt 1970
Condition
Fair
inspected January 2023
Type
Frame
Concrete
Length
55 ft
1 main span
Daily traffic
32,923
2017 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15)NB&AMP over South Ash Creek is a concrete frame carrying I-15 (SR-15)NB&AMP over South Ash Creek in Washington County, Utah. It was built in 1959 and reconstructed in 1970, so it is 66 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 32,923 vehicles a day, roughly 30% of them trucks, projected to reach 39,508 by 2037. The structure is 55 ft (16.9 m) long and 154 ft wide. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesI-15 (SR-15)NB&AMP
CrossesSouth Ash Creek
Location3.6 Mi.No.Anderson R.Int.
RouteInterstate 15
CountyWashington County
StateUtah
Coordinates37.33124, -113.2818
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating44.6 US tons
Inventory rating26.5 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length55 ft (16.9 m)
Longest span50 ft (15.2 m)
Deck width154 ft (46.9 m)
Roadway width148 ft (45.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic32,923 (2017)
Projected traffic39,508 by 2037
Trucks30%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.9 mi (32 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&AMP over South Ash Creek built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1970.

What condition is I-15 (SR-15)NB&AMP over South Ash 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 January 2023.

How much traffic does I-15 (SR-15)NB&AMP over South Ash Creek carry?

About 32,923 vehicles per day (2017 count), of which roughly 30% are trucks.

How long is I-15 (SR-15)NB&AMP over South Ash Creek?

The structure is 55 ft (16.9 m) long with a longest span of 50 ft (15.2 m) and a deck 154 ft wide.

Who owns I-15 (SR-15)NB&AMP over South Ash Creek?

It is owned by the State Highway Agency.