US Bridges

Horse Hollow Trail over I-15 (SR-15) Nbl & Sbl

Fair

Millard County, Utah · 1.8 MI So Kanosh Interchg · Structure no. 0F 220

Built
1973
52 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
280 ft
4 main spans
Daily traffic
500
2020 count
Owner
State
State Highway Agency

About this bridge

Horse Hollow Trail over I-15 (SR-15) Nbl & Sbl is a prestressed concrete stringer/multi-beam or girder carrying Horse Hollow Trail over I-15 (SR-15) Nbl & Sbl in Millard County, Utah. It was built in 1973, so it is 52 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 5 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 500 vehicles a day, projected to reach 1,000 by 2040. The structure is 280 ft (85.4 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesHorse Hollow Trail
CrossesI-15 (SR-15) Nbl & Sbl
Location1.8 MI So Kanosh Interchg
RouteCounty Highway 0
CountyMillard County
StateUtah
Coordinates38.74549, -112.57727
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 rating47.2 US tons
Inventory rating28.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length280 ft (85.4 m)
Longest span99 ft (30.3 m)
Deck width34 ft (10.5 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic500 (2020)
Projected traffic1,000 by 2040
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

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 Horse Hollow Trail over I-15 (SR-15) Nbl & Sbl built?

It was built in 1973, making it 52 years old in 2025.

What condition is Horse Hollow Trail over I-15 (SR-15) Nbl & Sbl 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 February 2023.

How much traffic does Horse Hollow Trail over I-15 (SR-15) Nbl & Sbl carry?

About 500 vehicles per day (2020 count).

How long is Horse Hollow Trail over I-15 (SR-15) Nbl & Sbl?

The structure is 280 ft (85.4 m) long with a longest span of 99 ft (30.3 m) and a deck 34 ft wide.

Who owns Horse Hollow Trail over I-15 (SR-15) Nbl & Sbl?

It is owned by the State Highway Agency.