N12 over Niobrara River
PoorKnox County, Nebraska · 1W Niobrara · Structure no. S012 16027
- Built
- 1978
- 47 years old, rebuilt 2020
- Condition
- Poor
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 762 ft
- 6 main spans
- Daily traffic
- 1,035
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
N12 over Niobrara River is a steel continuous stringer/multi-beam or girder carrying N12 over Niobrara River in Knox County, Nebraska. It was built in 1978 and reconstructed in 2020, so it is 47 years old, younger than the Nebraska average of 47.1 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 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 1,035 vehicles a day, roughly 8% of them trucks, projected to reach 1,346 by 2038. The structure is 762 ft (232.3 m) long and 34 ft wide. If it were closed, the detour would be 391.5 mi (630 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N12 over Niobrara River built?
It was built in 1978, making it 47 years old in 2025. It was reconstructed in 2020.
What condition is N12 over Niobrara River 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 October 2024.
How much traffic does N12 over Niobrara River carry?
About 1,035 vehicles per day (2018 count), of which roughly 8% are trucks.
How long is N12 over Niobrara River?
The structure is 762 ft (232.3 m) long with a longest span of 131 ft (39.9 m) and a deck 34 ft wide.
Who owns N12 over Niobrara River?
It is owned by the State Highway Agency.