N21 over Thirty Mile Canal
GoodDawson County, Nebraska · 6S Cozad · Structure no. S021 00738
- Built
- 1961
- 64 years old, rebuilt 1995
- Condition
- Good
- inspected October 2023
- Type
- Culvert
- Concrete
- Length
- 27 ft
- 3 main spans
- Daily traffic
- 985
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
N21 over Thirty Mile Canal is a concrete culvert carrying N21 over Thirty Mile Canal in Dawson County, Nebraska. It was built in 1961 and reconstructed in 1995, so it is 64 years old, older than the Nebraska average of 47.1 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 985 vehicles a day, roughly 14% of them trucks, projected to reach 1,330 by 2038. The structure is 27 ft (8.2 m) long. If it were closed, the detour would be 62.1 mi (100 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N21 over Thirty Mile Canal built?
It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1995.
What condition is N21 over Thirty Mile Canal in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.
How much traffic does N21 over Thirty Mile Canal carry?
About 985 vehicles per day (2018 count), of which roughly 14% are trucks.
How long is N21 over Thirty Mile Canal?
The structure is 27 ft (8.2 m) long with a longest span of 8 ft (2.4 m).
Who owns N21 over Thirty Mile Canal?
It is owned by the State Highway Agency.