US Bridges

I 86 WB Ramp over I 84

Good

Cassia County, Idaho · 12.7 E. Heyburn · Structure no. 000000000010603

Built
2020
5 years old
Condition
Good
inspected September 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
395 ft
2 main spans
Daily traffic
400
2023 count
Owner
State
State Highway Agency

About this bridge

I 86 WB Ramp over I 84 is a steel stringer/multi-beam or girder carrying I 86 WB Ramp over I 84 in Cassia County, Idaho. It was built in 2020, so it is 5 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 400 vehicles a day, projected to reach 600 by 2042. The structure is 395 ft (120.4 m) long and 32 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesI 86 WB Ramp
CrossesI 84
Location12.7 E. Heyburn
RouteInterstate 86
CountyCassia County
StateIdaho
Coordinates42.57044, -113.52458
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating90.7 US tons
Inventory rating70 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length395 ft (120.4 m)
Longest span196 ft (59.7 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2023)
Projected traffic600 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed11.8 mi (19 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 86 WB Ramp over I 84 built?

It was built in 2020, making it 5 years old in 2025.

What condition is I 86 WB Ramp over I 84 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2022.

How much traffic does I 86 WB Ramp over I 84 carry?

About 400 vehicles per day (2023 count).

How long is I 86 WB Ramp over I 84?

The structure is 395 ft (120.4 m) long with a longest span of 196 ft (59.7 m) and a deck 32 ft wide.

Who owns I 86 WB Ramp over I 84?

It is owned by the State Highway Agency.