S 435 over Elk Creek
FairLewis and Clark County, Montana · 6M SW Augusta · Structure no. S00435006+09751
- Built
- 1958
- 67 years old
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 39 ft
- 2 main spans
- Daily traffic
- 137
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
S 435 over Elk Creek is a wood or timber stringer/multi-beam or girder carrying S 435 over Elk Creek in Lewis and Clark County, Montana. It was built in 1958, so it is 67 years old, older than the Montana average of 47 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 137 vehicles a day, roughly 2% of them trucks, projected to reach 144 by 2043. The structure is 39 ft (11.9 m) long and 26 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 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 435 over Elk Creek built?
It was built in 1958, making it 67 years old in 2025.
What condition is S 435 over Elk Creek 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 September 2023.
How much traffic does S 435 over Elk Creek carry?
About 137 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is S 435 over Elk Creek?
The structure is 39 ft (11.9 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.
Who owns S 435 over Elk Creek?
It is owned by the County Highway Agency.