US 85 over Cheyenne River
FairNiobrara County, Wyoming · Mule Creek Jct-Newcastle · Structure no. FRA
- Built
- 1990
- 35 years old
- Condition
- Fair
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 420 ft
- 3 main spans
- Daily traffic
- 1,084
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US 85 over Cheyenne River is a steel continuous stringer/multi-beam or girder carrying US 85 over Cheyenne River in Niobrara County, Wyoming. It was built in 1990, so it is 35 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 5 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 1,084 vehicles a day, roughly 15% of them trucks, projected to reach 1,518 by 2043. The structure is 420 ft (128 m) long and 43 ft wide. If it were closed, the detour would be 98.8 mi (159 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 85 over Cheyenne River built?
It was built in 1990, making it 35 years old in 2025.
What condition is US 85 over Cheyenne 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 June 2024.
How much traffic does US 85 over Cheyenne River carry?
About 1,084 vehicles per day (2024 count), of which roughly 15% are trucks.
How long is US 85 over Cheyenne River?
The structure is 420 ft (128 m) long with a longest span of 164 ft (50 m) and a deck 43 ft wide.
Who owns US 85 over Cheyenne River?
It is owned by the State Highway Agency.