Marshall Creek RD over Rock Creek
PoorGranite County, Montana · 14M W Philipsburg · Structure no. S00348014+02001
- Built
- 1959
- 66 years old
- Condition
- Poor
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 102 ft
- 2 main spans
- Daily traffic
- 161
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Marshall Creek RD over Rock Creek is a prestressed concrete stringer/multi-beam or girder carrying Marshall Creek RD over Rock Creek in Granite 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 161 vehicles a day, roughly 7% of them trucks, projected to reach 176 by 2043. The structure is 102 ft (31.1 m) long and 27 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| 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 Marshall Creek RD over Rock Creek built?
It was built in 1959, making it 66 years old in 2025.
What condition is Marshall Creek RD over Rock Creek 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 July 2024.
How much traffic does Marshall Creek RD over Rock Creek carry?
About 161 vehicles per day (2023 count), of which roughly 7% are trucks.
How long is Marshall Creek RD over Rock Creek?
The structure is 102 ft (31.1 m) long with a longest span of 51 ft (15.5 m) and a deck 27 ft wide.
Who owns Marshall Creek RD over Rock Creek?
It is owned by the State Highway Agency.