US 20 over Mason Drain Ditch
FairCanyon County, Idaho · 3.6 E. Caldwell · Structure no. 000000000012240
- Built
- 1947
- 78 years old
- Condition
- Fair
- inspected February 2023
- Type
- Frame
- Concrete
- Length
- 25 ft
- 1 main span
- Daily traffic
- 14,500
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 20 over Mason Drain Ditch is a concrete frame carrying US 20 over Mason Drain Ditch in Canyon County, Idaho. It was built in 1947, so it is 78 years old, older than the Idaho average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 14,500 vehicles a day, roughly 8% of them trucks, projected to reach 21,750 by 2042. The structure is 25 ft (7.6 m) long and 54 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 20 over Mason Drain Ditch built?
It was built in 1947, making it 78 years old in 2025.
What condition is US 20 over Mason Drain Ditch 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 February 2023.
How much traffic does US 20 over Mason Drain Ditch carry?
About 14,500 vehicles per day (2023 count), of which roughly 8% are trucks.
How long is US 20 over Mason Drain Ditch?
The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m) and a deck 54 ft wide.
Who owns US 20 over Mason Drain Ditch?
It is owned by the State Highway Agency.