US Bridges

I-15 (SR-15) Nbl over Ramp I-15SB to US-89SB

Fair

Davis County, Utah · 500 W. .Intchg. Bountiful · Structure no. 1C 302

Built
1960
65 years old, rebuilt 2000
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
232 ft
3 main spans
Daily traffic
132,631
2017 count
Owner
State
State Highway Agency

About this bridge

I-15 (SR-15) Nbl over Ramp I-15SB to US-89SB is a steel continuous stringer/multi-beam or girder carrying I-15 (SR-15) Nbl over Ramp I-15SB to US-89SB in Davis County, Utah. It was built in 1960 and reconstructed in 2000, so it is 65 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 132,631 vehicles a day, roughly 19% of them trucks, projected to reach 159,157 by 2037. The structure is 232 ft (70.7 m) long and 69 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesI-15 (SR-15) Nbl
CrossesRamp I-15SB to US-89SB
Location500 W. .Intchg. Bountiful
RouteInterstate 15
CountyDavis County
StateUtah
Coordinates40.90013, -111.89247
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.1 US tons
Inventory rating31.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length232 ft (70.7 m)
Longest span70 ft (21.3 m)
Deck width69 ft (21 m)
Roadway width66 ft (20.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic132,631 (2017)
Projected traffic159,157 by 2037
Trucks19%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 Ramp I-15SB to US-89SB built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2000.

What condition is I-15 (SR-15) Nbl over Ramp I-15SB to US-89SB 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) Nbl over Ramp I-15SB to US-89SB carry?

About 132,631 vehicles per day (2017 count), of which roughly 19% are trucks.

How long is I-15 (SR-15) Nbl over Ramp I-15SB to US-89SB?

The structure is 232 ft (70.7 m) long with a longest span of 70 ft (21.3 m) and a deck 69 ft wide.

Who owns I-15 (SR-15) Nbl over Ramp I-15SB to US-89SB?

It is owned by the State Highway Agency.