Wyo 487 over Little Medicine Bow Rvr
FairCarbon County, Wyoming · Medicine Bow - Jt Wyo 220 · Structure no. CMM
- Built
- 1959
- 66 years old
- Condition
- Fair
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 173 ft
- 3 main spans
- Daily traffic
- 506
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Wyo 487 over Little Medicine Bow Rvr is a steel continuous stringer/multi-beam or girder carrying Wyo 487 over Little Medicine Bow Rvr in Carbon County, Wyoming. It was built in 1959, so it is 66 years old, older 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 506 vehicles a day, roughly 11% of them trucks, projected to reach 708 by 2043. The structure is 173 ft (52.6 m) long and 35 ft wide. If it were closed, the detour would be 78.9 mi (127 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Wyo 487 over Little Medicine Bow Rvr built?
It was built in 1959, making it 66 years old in 2025.
What condition is Wyo 487 over Little Medicine Bow Rvr 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 Wyo 487 over Little Medicine Bow Rvr carry?
About 506 vehicles per day (2024 count), of which roughly 11% are trucks.
How long is Wyo 487 over Little Medicine Bow Rvr?
The structure is 173 ft (52.6 m) long with a longest span of 65 ft (19.8 m) and a deck 35 ft wide.
Who owns Wyo 487 over Little Medicine Bow Rvr?
It is owned by the State Highway Agency.