US 20 Wbl over Snake River Dry Bed Cnl
FairJefferson County, Idaho · 2.3 N. Rigby · Structure no. 000000000012470
- Built
- 1975
- 50 years old
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 72 ft
- 1 main span
- Daily traffic
- 9,750
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 20 Wbl over Snake River Dry Bed Cnl is a prestressed concrete stringer/multi-beam or girder carrying US 20 Wbl over Snake River Dry Bed Cnl in Jefferson County, Idaho. It was built in 1975, so it is 50 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 13% of them trucks, projected to reach 14,625 by 2042. The structure is 72 ft (21.9 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 20 Wbl over Snake River Dry Bed Cnl built?
It was built in 1975, making it 50 years old in 2025.
What condition is US 20 Wbl over Snake River Dry Bed Cnl 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 US 20 Wbl over Snake River Dry Bed Cnl carry?
About 9,750 vehicles per day (2023 count), of which roughly 13% are trucks.
How long is US 20 Wbl over Snake River Dry Bed Cnl?
The structure is 72 ft (21.9 m) long with a longest span of 71 ft (21.6 m) and a deck 44 ft wide.
Who owns US 20 Wbl over Snake River Dry Bed Cnl?
It is owned by the State Highway Agency.