US Bridges

I-15 (SR-15) Nbl over SR-99 Intchg. X-Road

Fair

Millard County, Utah · No.Fillmore Interchange · Structure no. 1F 203

Built
1972
53 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
171 ft
3 main spans
Daily traffic
24,744
2022 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over SR-99 Intchg. X-Road is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over SR-99 Intchg. X-Road in Millard County, Utah. It was built in 1972, so it is 53 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 24,744 vehicles a day, roughly 42% of them trucks, projected to reach 29,693 by 2042. The structure is 171 ft (52 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI-15 (SR-15) Nbl
CrossesSR-99 Intchg. X-Road
LocationNo.Fillmore Interchange
RouteInterstate 15
CountyMillard County
StateUtah
Coordinates38.99167, -112.32361
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 evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.2 US tons
Inventory rating4.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length171 ft (52 m)
Longest span85 ft (25.9 m)
Deck width44 ft (13.4 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,744 (2022)
Projected traffic29,693 by 2042
Trucks42%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
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 SR-99 Intchg. X-Road built?

It was built in 1972, making it 53 years old in 2025.

What condition is I-15 (SR-15) Nbl over SR-99 Intchg. X-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 SR-99 Intchg. X-Road carry?

About 24,744 vehicles per day (2022 count), of which roughly 42% are trucks.

How long is I-15 (SR-15) Nbl over SR-99 Intchg. X-Road?

The structure is 171 ft (52 m) long with a longest span of 85 ft (25.9 m) and a deck 44 ft wide.

Who owns I-15 (SR-15) Nbl over SR-99 Intchg. X-Road?

It is owned by the State Highway Agency.