US Bridges

I 15 Nbl over Stc 1762;PORTNEUF RD Ic

Fair

Bannock County, Idaho · 3.6 S. Pocatello · Structure no. 000000000011205

Built
1963
62 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
165 ft
3 main spans
Daily traffic
9,750
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 Nbl over Stc 1762;PORTNEUF RD Ic is a prestressed concrete stringer/multi-beam or girder carrying I 15 Nbl over Stc 1762;PORTNEUF RD Ic in Bannock County, Idaho. It was built in 1963, so it is 62 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 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 9,750 vehicles a day, roughly 20% of them trucks, projected to reach 14,625 by 2042. The structure is 165 ft (50.3 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 15 Nbl
CrossesStc 1762;PORTNEUF RD Ic
Location3.6 S. Pocatello
RouteInterstate 15
CountyBannock County
StateIdaho
Coordinates42.79903, -112.36325
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.
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 inspectionSeptember 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 rating70 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length165 ft (50.3 m)
Longest span53 ft (16.2 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,750 (2023)
Projected traffic14,625 by 2042
Trucks20%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
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 statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.1 million (2019 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 15 Nbl over Stc 1762;PORTNEUF RD Ic built?

It was built in 1963, making it 62 years old in 2025.

What condition is I 15 Nbl over Stc 1762;PORTNEUF RD 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 September 2023.

How much traffic does I 15 Nbl over Stc 1762;PORTNEUF RD Ic carry?

About 9,750 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is I 15 Nbl over Stc 1762;PORTNEUF RD Ic?

The structure is 165 ft (50.3 m) long with a longest span of 53 ft (16.2 m) and a deck 40 ft wide.

Who owns I 15 Nbl over Stc 1762;PORTNEUF RD Ic?

It is owned by the State Highway Agency.