US 20 over S Fork Niobrara River
FairNiobrara County, Wyoming · Lusk - Nebr. State Line · Structure no. FDY
- Built
- 1986
- 39 years old
- Condition
- Fair
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 118 ft
- 3 main spans
- Daily traffic
- 529
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US 20 over S Fork Niobrara River is a steel continuous stringer/multi-beam or girder carrying US 20 over S Fork Niobrara River in Niobrara County, Wyoming. It was built in 1986, so it is 39 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 529 vehicles a day, roughly 19% of them trucks, projected to reach 741 by 2043. The structure is 118 ft (36 m) long and 39 ft wide. If it were closed, the detour would be 67.1 mi (108 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 20 over S Fork Niobrara River built?
It was built in 1986, making it 39 years old in 2025.
What condition is US 20 over S Fork 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 January 2025.
How much traffic does US 20 over S Fork Niobrara River carry?
About 529 vehicles per day (2024 count), of which roughly 19% are trucks.
How long is US 20 over S Fork Niobrara River?
The structure is 118 ft (36 m) long with a longest span of 44 ft (13.4 m) and a deck 39 ft wide.
Who owns US 20 over S Fork Niobrara River?
It is owned by the State Highway Agency.