US Bridges

I-15 (SR-15) Sbl over UPRR Hill Afb Branch

Fair

Weber County, Utah · Southeast of Roy · Structure no. 3F 80

Built
1966
59 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
211 ft
3 main spans
Daily traffic
138,457
2023 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Sbl over UPRR Hill Afb Branch is a prestressed concrete stringer/multi-beam or girder carrying I-15 (SR-15) Sbl over UPRR Hill Afb Branch in Weber County, Utah. It was built in 1966, so it is 59 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 138,457 vehicles a day, roughly 33% of them trucks, projected to reach 166,148 by 2043. The structure is 211 ft (64.3 m) long and 72 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-15 (SR-15) Sbl
CrossesUPRR Hill Afb Branch
LocationSoutheast of Roy
RouteInterstate 15
CountyWeber County
StateUtah
Coordinates41.15833, -112.02444
Functional classUrban 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
Deck7 GoodSome minor problems.
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 inspectionJune 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 geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length211 ft (64.3 m)
Longest span62 ft (19 m)
Deck width72 ft (21.9 m)
Roadway width66 ft (20 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic138,457 (2023)
Projected traffic166,148 by 2043
Trucks33%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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) Sbl over UPRR Hill Afb Branch built?

It was built in 1966, making it 59 years old in 2025.

What condition is I-15 (SR-15) Sbl over UPRR Hill Afb Branch 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 June 2023.

How much traffic does I-15 (SR-15) Sbl over UPRR Hill Afb Branch carry?

About 138,457 vehicles per day (2023 count), of which roughly 33% are trucks.

How long is I-15 (SR-15) Sbl over UPRR Hill Afb Branch?

The structure is 211 ft (64.3 m) long with a longest span of 62 ft (19 m) and a deck 72 ft wide.

Who owns I-15 (SR-15) Sbl over UPRR Hill Afb Branch?

It is owned by the State Highway Agency.