Sma 7721; Riverton over Blackfoot River Overflow
FairBingham County, Idaho · 1.1 S. 2.3 W. Blackfoot · Structure no. 000000000019295
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected October 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 78 ft
- 1 main span
- Daily traffic
- 340
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Sma 7721; Riverton over Blackfoot River Overflow is a prestressed concrete tee beam carrying Sma 7721; Riverton over Blackfoot River Overflow in Bingham County, Idaho. It was built in 1964, so it is 61 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 340 vehicles a day, roughly 13% of them trucks, projected to reach 510 by 2042. The structure is 78 ft (23.8 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Sma 7721; Riverton over Blackfoot River Overflow built?
It was built in 1964, making it 61 years old in 2025.
What condition is Sma 7721; Riverton over Blackfoot River Overflow 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 October 2023.
How much traffic does Sma 7721; Riverton over Blackfoot River Overflow carry?
About 340 vehicles per day (2023 count), of which roughly 13% are trucks.
How long is Sma 7721; Riverton over Blackfoot River Overflow?
The structure is 78 ft (23.8 m) long with a longest span of 75 ft (22.9 m) and a deck 30 ft wide.
Who owns Sma 7721; Riverton over Blackfoot River Overflow?
It is owned by the County Highway Agency.