US Bridges

US 20 over I 15 Nb-Sb;johns Hole Ic

Good

Bonneville County, Idaho · In Idaho Falls · Structure no. 000000000012310

Built
1962
63 years old, rebuilt 1992
Condition
Good
inspected May 2024
Type
Tee Beam
Prestressed Concrete
Length
196 ft
4 main spans
Daily traffic
24,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 over I 15 Nb-Sb;johns Hole Ic is a prestressed concrete tee beam carrying US 20 over I 15 Nb-Sb;johns Hole Ic in Bonneville County, Idaho. It was built in 1962 and reconstructed in 1992, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 24,000 vehicles a day, roughly 7% of them trucks, projected to reach 36,000 by 2042. The structure is 196 ft (59.7 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 20
CrossesI 15 Nb-Sb;johns Hole Ic
LocationIn Idaho Falls
RouteU.S. Route 20
CountyBonneville County
StateIdaho
Coordinates43.50425, -112.05631
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70 US tons
Inventory rating35.1 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length196 ft (59.7 m)
Longest span63 ft (19.2 m)
Deck width69 ft (20.9 m)
Roadway width61 ft (18.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,000 (2023)
Projected traffic36,000 by 2042
Trucks7%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 US 20 over I 15 Nb-Sb;johns Hole Ic built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1992.

What condition is US 20 over I 15 Nb-Sb;johns Hole Ic 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 May 2024.

How much traffic does US 20 over I 15 Nb-Sb;johns Hole Ic carry?

About 24,000 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 20 over I 15 Nb-Sb;johns Hole Ic?

The structure is 196 ft (59.7 m) long with a longest span of 63 ft (19.2 m) and a deck 69 ft wide.

Who owns US 20 over I 15 Nb-Sb;johns Hole Ic?

It is owned by the State Highway Agency.