US Bridges

I-15 (SR-15) over Winn Hollow Wash

Fair

Iron County, Utah · 7.3 Mi.No. No.Cedar Int. · Structure no. 0E1655

Built
1970
55 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
26 ft
2 main spans
Daily traffic
20,720
2014 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) over Winn Hollow Wash is a concrete continuous culvert carrying I-15 (SR-15) over Winn Hollow Wash in Iron County, Utah. It was built in 1970, so it is 55 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 20,720 vehicles a day, roughly 45% of them trucks, projected to reach 25,900 by 2034. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesI-15 (SR-15)
CrossesWinn Hollow Wash
Location7.3 Mi.No. No.Cedar Int.
RouteInterstate 15
CountyIron County
StateUtah
Coordinates37.79236, -112.96275
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 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 rating60.7 US tons
Inventory rating53.6 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 deckUnrestricted

Traffic and service

Average daily traffic20,720 (2014)
Projected traffic25,900 by 2034
Trucks45%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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) over Winn Hollow Wash built?

It was built in 1970, making it 55 years old in 2025.

What condition is I-15 (SR-15) over Winn Hollow Wash 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) over Winn Hollow Wash carry?

About 20,720 vehicles per day (2014 count), of which roughly 45% are trucks.

How long is I-15 (SR-15) over Winn Hollow Wash?

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) over Winn Hollow Wash?

It is owned by the State Highway Agency.