US Bridges

I-15 (SR-15) Nbl over County Road

Fair

Millard County, Utah · 4.8 Mi.No.No.Holden Inter · Structure no. 1F 347

Built
1978
47 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
18,195
2022 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over County Road is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over County Road in Millard County, Utah. It was built in 1978, so it is 47 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 18,195 vehicles a day, roughly 33% of them trucks, projected to reach 21,834 by 2042. The structure is 82 ft (25.1 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 (SR-15) Nbl
CrossesCounty Road
Location4.8 Mi.No.No.Holden Inter
RouteInterstate 15
CountyMillard County
StateUtah
Coordinates39.18799, -112.19628
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length82 ft (25.1 m)
Longest span80 ft (24.4 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,195 (2022)
Projected traffic21,834 by 2042
Trucks33%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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) Nbl over County Road built?

It was built in 1978, making it 47 years old in 2025.

What condition is I-15 (SR-15) Nbl over County Road 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 I-15 (SR-15) Nbl over County Road carry?

About 18,195 vehicles per day (2022 count), of which roughly 33% are trucks.

How long is I-15 (SR-15) Nbl over County Road?

The structure is 82 ft (25.1 m) long with a longest span of 80 ft (24.4 m) and a deck 44 ft wide.

Who owns I-15 (SR-15) Nbl over County Road?

It is owned by the State Highway Agency.