US 18 over Niobrara River
FairNiobrara County, Wyoming · Lusk · Structure no. FDE
- Built
- 1988
- 37 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 109 ft
- 1 main span
- Daily traffic
- 2,942
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US 18 over Niobrara River is a steel stringer/multi-beam or girder carrying US 18 over Niobrara River in Niobrara County, Wyoming. It was built in 1988, so it is 37 years old, younger than the Wyoming average of 48.4 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 2,942 vehicles a day, roughly 14% of them trucks, projected to reach 4,119 by 2043. The structure is 109 ft (33.2 m) long and 65 ft wide. If it were closed, the detour would be 23 mi (37 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 18 over Niobrara River built?
It was built in 1988, making it 37 years old in 2025.
What condition is US 18 over Niobrara River 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 March 2024.
How much traffic does US 18 over Niobrara River carry?
About 2,942 vehicles per day (2024 count), of which roughly 14% are trucks.
How long is US 18 over Niobrara River?
The structure is 109 ft (33.2 m) long with a longest span of 103 ft (31.3 m) and a deck 65 ft wide.
Who owns US 18 over Niobrara River?
It is owned by the State Highway Agency.