US Bridges

I-15 (SR-15)NB SB over Ash Creek Res. Spillway

Fair

Washington County, Utah · 0.5 Mi.No.Black Ridge Int · Structure no. 0E1209

Built
1960
65 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete
Length
25 ft
1 main span
Daily traffic
22,515
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15)NB SB over Ash Creek Res. Spillway is a concrete culvert carrying I-15 (SR-15)NB SB over Ash Creek Res. Spillway in Washington County, Utah. It was built in 1960, so it is 65 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 22,515 vehicles a day, roughly 43% of them trucks, projected to reach 28,144 by 2034. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 19.9 mi (32 km).

Location

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CarriesI-15 (SR-15)NB SB
CrossesAsh Creek Res. Spillway
Location0.5 Mi.No.Black Ridge Int
RouteInterstate 15
CountyWashington County
StateUtah
Coordinates37.41147, -113.23519
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.7 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20 + Mod
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic22,515 (2014)
Projected traffic28,144 by 2034
Trucks43%
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 SB over Ash Creek Res. Spillway built?

It was built in 1960, making it 65 years old in 2025.

What condition is I-15 (SR-15)NB SB over Ash Creek Res. Spillway 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 2025.

How much traffic does I-15 (SR-15)NB SB over Ash Creek Res. Spillway carry?

About 22,515 vehicles per day (2014 count), of which roughly 43% are trucks.

How long is I-15 (SR-15)NB SB over Ash Creek Res. Spillway?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m).

Who owns I-15 (SR-15)NB SB over Ash Creek Res. Spillway?

It is owned by the State Highway Agency.