N21 over Tri-County Canal
GoodDawson County, Nebraska · 8S Cozad · Structure no. S021 00579
- Built
- 1964
- 61 years old, rebuilt 2014
- Condition
- Good
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 351 ft
- 4 main spans
- Daily traffic
- 985
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
N21 over Tri-County Canal is a steel continuous stringer/multi-beam or girder carrying N21 over Tri-County Canal in Dawson County, Nebraska. It was built in 1964 and reconstructed in 2014, so it is 61 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 351 ft (107 m) long and 33 ft wide. If it were closed, the detour would be 37.3 mi (60 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 |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N21 over Tri-County Canal built?
It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2014.
What condition is N21 over Tri-County 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 Tri-County Canal carry?
About 985 vehicles per day (2018 count), of which roughly 14% are trucks.
How long is N21 over Tri-County Canal?
The structure is 351 ft (107 m) long with a longest span of 120 ft (36.6 m) and a deck 33 ft wide.
Who owns N21 over Tri-County Canal?
It is owned by the State Highway Agency.