US Bridges

I 15 Nbl over I 15B;BROADWAY St.Ic

Fair

Bonneville County, Idaho · In Idaho Falls;broadway · Structure no. 000000000011720

Built
1962
63 years old
Condition
Fair
inspected May 2023
Type
Tee Beam
Concrete
Length
175 ft
4 main spans
Daily traffic
12,750
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 Nbl over I 15B;BROADWAY St.Ic is a concrete tee beam carrying I 15 Nbl over I 15B;BROADWAY St.Ic in Bonneville County, Idaho. It was built in 1962, so it is 63 years old, older than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 12,750 vehicles a day, roughly 19% of them trucks, projected to reach 19,125 by 2042. The structure is 175 ft (53.3 m) long and 40 ft wide.

Location

Open in Google Maps
CarriesI 15 Nbl
CrossesI 15B;BROADWAY St.Ic
LocationIn Idaho Falls;broadway
RouteInterstate 15
CountyBonneville County
StateIdaho
Coordinates43.49636, -112.05372
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 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 rating45 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length175 ft (53.3 m)
Longest span52 ft (15.9 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,750 (2023)
Projected traffic19,125 by 2042
Trucks19%
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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.2 million (2019 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 15 Nbl over I 15B;BROADWAY St.Ic built?

It was built in 1962, making it 63 years old in 2025.

What condition is I 15 Nbl over I 15B;BROADWAY St.Ic 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 May 2023.

How much traffic does I 15 Nbl over I 15B;BROADWAY St.Ic carry?

About 12,750 vehicles per day (2023 count), of which roughly 19% are trucks.

How long is I 15 Nbl over I 15B;BROADWAY St.Ic?

The structure is 175 ft (53.3 m) long with a longest span of 52 ft (15.9 m) and a deck 40 ft wide.

Who owns I 15 Nbl over I 15B;BROADWAY St.Ic?

It is owned by the State Highway Agency.