County Road 55 over South Platte River
FairLogan County, Colorado · 1.2 MI S of HWY 138 · Structure no. LOG55-44.0-143A
- Built
- 1990
- 35 years old
- Condition
- Fair
- inspected December 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 310 ft
- 3 main spans
- Daily traffic
- 345
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
County Road 55 over South Platte River is a prestressed concrete continuous stringer/multi-beam or girder carrying County Road 55 over South Platte River in Logan County, Colorado. It was built in 1990, so it is 35 years old, younger than the Colorado average of 42.2 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 345 vehicles a day, roughly 38% of them trucks, projected to reach 425 by 2042. The structure is 310 ft (94.6 m) long and 33 ft wide. If it were closed, the detour would be 8.7 mi (14 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| 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 County Road 55 over South Platte River built?
It was built in 1990, making it 35 years old in 2025.
What condition is County Road 55 over South Platte 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 December 2023.
How much traffic does County Road 55 over South Platte River carry?
About 345 vehicles per day (2023 count), of which roughly 38% are trucks.
How long is County Road 55 over South Platte River?
The structure is 310 ft (94.6 m) long with a longest span of 101 ft (30.8 m) and a deck 33 ft wide.
Who owns County Road 55 over South Platte River?
It is owned by the County Highway Agency.