N21 over Platte River
GoodDawson County, Nebraska · 1S Cozad · Structure no. S021 01167
- Built
- 1987
- 38 years old
- Condition
- Good
- inspected November 2021
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 675 ft
- 10 main spans
- Daily traffic
- 1,755
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
N21 over Platte River is a prestressed concrete stringer/multi-beam or girder carrying N21 over Platte River in Dawson County, Nebraska. It was built in 1987, so it is 38 years old, younger 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 1,755 vehicles a day, roughly 12% of them trucks, projected to reach 2,457 by 2038. The structure is 675 ft (205.7 m) long and 43 ft wide. If it were closed, the detour would be 142.9 mi (230 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 | 9 Excellent | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N21 over Platte River built?
It was built in 1987, making it 38 years old in 2025.
What condition is N21 over Platte River 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 November 2021.
How much traffic does N21 over Platte River carry?
About 1,755 vehicles per day (2018 count), of which roughly 12% are trucks.
How long is N21 over Platte River?
The structure is 675 ft (205.7 m) long with a longest span of 67 ft (20.4 m) and a deck 43 ft wide.
Who owns N21 over Platte River?
It is owned by the State Highway Agency.