US Bridges

US 20 Ebl & Wbl over Snake R.;johns Hole Br.

Fair

Bonneville County, Idaho · In Idaho Falls · Structure no. 000000000012335

Built
1966
59 years old, rebuilt 1991
Condition
Fair
inspected May 2021
Type
Stringer/Multi-beam or Girder
Steel
Length
179 ft
1 main span
Daily traffic
38,000
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 Ebl & Wbl over Snake R.;johns Hole Br. is a steel stringer/multi-beam or girder carrying US 20 Ebl & Wbl over Snake R.;johns Hole Br. in Bonneville County, Idaho. It was built in 1966 and reconstructed in 1991, so it is 59 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 38,000 vehicles a day, roughly 18% of them trucks, projected to reach 57,000 by 2042. The structure is 179 ft (54.6 m) long and 92 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUS 20 Ebl & Wbl
CrossesSnake R.;johns Hole Br.
LocationIn Idaho Falls
RouteU.S. Route 20
CountyBonneville County
StateIdaho
Coordinates43.5065, -112.05044
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length179 ft (54.6 m)
Longest span175 ft (53.3 m)
Deck width92 ft (27.9 m)
Roadway width81 ft (24.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic38,000 (2023)
Projected traffic57,000 by 2042
Trucks18%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 20 Ebl & Wbl over Snake R.;johns Hole Br. built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1991.

What condition is US 20 Ebl & Wbl over Snake R.;johns Hole Br. 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 2021.

How much traffic does US 20 Ebl & Wbl over Snake R.;johns Hole Br. carry?

About 38,000 vehicles per day (2023 count), of which roughly 18% are trucks.

How long is US 20 Ebl & Wbl over Snake R.;johns Hole Br.?

The structure is 179 ft (54.6 m) long with a longest span of 175 ft (53.3 m) and a deck 92 ft wide.

Who owns US 20 Ebl & Wbl over Snake R.;johns Hole Br.?

It is owned by the State Highway Agency.