SR 117 over Missouri River Overflow
PoorValley County, Montana · 1M N Fort Peck · Structure no. P00017003+01001
- Built
- 1950
- 75 years old, rebuilt 1984
- Condition
- Poor
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 280 ft
- 5 main spans
- Daily traffic
- 818
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 117 over Missouri River Overflow is a steel stringer/multi-beam or girder carrying SR 117 over Missouri River Overflow in Valley County, Montana. It was built in 1950 and reconstructed in 1984, so it is 75 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 818 vehicles a day, roughly 1% of them trucks, projected to reach 859 by 2043. The structure is 280 ft (85.3 m) long and 30 ft wide. If it were closed, the detour would be 39.8 mi (64 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SR 117 over Missouri River Overflow built?
It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1984.
What condition is SR 117 over Missouri River Overflow in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.
How much traffic does SR 117 over Missouri River Overflow carry?
About 818 vehicles per day (2023 count), of which roughly 1% are trucks.
How long is SR 117 over Missouri River Overflow?
The structure is 280 ft (85.3 m) long with a longest span of 56 ft (17.1 m) and a deck 30 ft wide.
Who owns SR 117 over Missouri River Overflow?
It is owned by the State Highway Agency.