S Main Street over Clark Fork River 020
PoorGranite County, Montana · S Drummond · Structure no. L20016000+05001
- Built
- 1934
- 91 years old
- Condition
- Poor
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 267 ft
- 4 main spans
- Daily traffic
- 371
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
S Main Street over Clark Fork River 020 is a steel stringer/multi-beam or girder carrying S Main Street over Clark Fork River 020 in Granite County, Montana. It was built in 1934, so it is 91 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 371 vehicles a day, roughly 3% of them trucks, projected to reach 395 by 2043. The structure is 267 ft (81.4 m) long and 25 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 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 | 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S Main Street over Clark Fork River 020 built?
It was built in 1934, making it 91 years old in 2025.
What condition is S Main Street over Clark Fork River 020 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 2024.
How much traffic does S Main Street over Clark Fork River 020 carry?
About 371 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is S Main Street over Clark Fork River 020?
The structure is 267 ft (81.4 m) long with a longest span of 75 ft (22.9 m) and a deck 25 ft wide.
Who owns S Main Street over Clark Fork River 020?
It is owned by the County Highway Agency.