US Bridges

I 86 Wbl over Sma 7031;HAWTHORNE Rd.Gs

Fair

Bannock County, Idaho · In Chubbuck · Structure no. 000000000010890

Built
1968
57 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
123 ft
3 main spans
Daily traffic
6,750
2023 count
Owner
State
State Highway Agency

About this bridge

I 86 Wbl over Sma 7031;HAWTHORNE Rd.Gs is a prestressed concrete stringer/multi-beam or girder carrying I 86 Wbl over Sma 7031;HAWTHORNE Rd.Gs in Bannock County, Idaho. It was built in 1968, so it is 57 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 6,750 vehicles a day, roughly 24% of them trucks, projected to reach 10,125 by 2042. The structure is 123 ft (37.5 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 86 Wbl
CrossesSma 7031;HAWTHORNE Rd.Gs
LocationIn Chubbuck
RouteInterstate 86
CountyBannock County
StateIdaho
Coordinates42.91303, -112.47594
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length123 ft (37.5 m)
Longest span40 ft (12.2 m)
Deck width40 ft (12.3 m)
Roadway width37 ft (11.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,750 (2023)
Projected traffic10,125 by 2042
Trucks24%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
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$1.6 million (2020 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 86 Wbl over Sma 7031;HAWTHORNE Rd.Gs built?

It was built in 1968, making it 57 years old in 2025.

What condition is I 86 Wbl over Sma 7031;HAWTHORNE Rd.Gs 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 August 2024.

How much traffic does I 86 Wbl over Sma 7031;HAWTHORNE Rd.Gs carry?

About 6,750 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is I 86 Wbl over Sma 7031;HAWTHORNE Rd.Gs?

The structure is 123 ft (37.5 m) long with a longest span of 40 ft (12.2 m) and a deck 40 ft wide.

Who owns I 86 Wbl over Sma 7031;HAWTHORNE Rd.Gs?

It is owned by the State Highway Agency.