Forest Road 421 over Little Mallard Creek
PoorIdaho County, Idaho · At Salmon River · Structure no. 011705000000082
- Built
- 1984
- 41 years old
- Condition
- Poor
- inspected August 2022
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 24 ft
- 1 main span
- Daily traffic
- 50
- Owner
- Federal
- U.S. Forest Service
About this bridge
Forest Road 421 over Little Mallard Creek is a wood or timber stringer/multi-beam or girder carrying Forest Road 421 over Little Mallard Creek in Idaho County, Idaho. It was built in 1984, so it is 41 years old, younger than the Idaho average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 2 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 50 vehicles a day, projected to reach 75 by 2045. The structure is 24 ft (7.3 m) long and 16 ft wide. If it were closed, the detour would be 98.2 mi (158 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 | 2 Critical | Advanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, 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 Forest Road 421 over Little Mallard Creek built?
It was built in 1984, making it 41 years old in 2025.
What condition is Forest Road 421 over Little Mallard 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 August 2022.
How much traffic does Forest Road 421 over Little Mallard Creek carry?
About 50 vehicles per day (latest count).
How long is Forest Road 421 over Little Mallard Creek?
The structure is 24 ft (7.3 m) long with a longest span of 23 ft (6.9 m) and a deck 16 ft wide.
Who owns Forest Road 421 over Little Mallard Creek?
It is owned by the U.S. Forest Service.