US 191 over Missouri River
PoorFergus County, Montana · 29M NE Roy · Structure no. P00061088+00671
- Built
- 1959
- 66 years old
- Condition
- Poor
- inspected September 2023
- Type
- Girder and Floorbeam System
- Steel Continuous
- Length
- 698 ft
- 4 main spans
- Daily traffic
- 655
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 191 over Missouri River is a steel continuous girder and floorbeam system carrying US 191 over Missouri River in Fergus County, Montana. It was built in 1959, so it is 66 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 655 vehicles a day, roughly 6% of them trucks, projected to reach 688 by 2043. The structure is 698 ft (212.7 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 US 191 over Missouri River built?
It was built in 1959, making it 66 years old in 2025.
What condition is US 191 over Missouri River 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 September 2023.
How much traffic does US 191 over Missouri River carry?
About 655 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is US 191 over Missouri River?
The structure is 698 ft (212.7 m) long with a longest span of 180 ft (54.9 m) and a deck 32 ft wide.
Who owns US 191 over Missouri River?
It is owned by the State Highway Agency.