SH 55 Ml over South Platte River
GoodLogan County, Colorado · 1.4 MI S of JCT SH55+US13 · Structure no. A-25-AT
- Built
- 1987
- 38 years old
- Condition
- Good
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 180 ft
- 2 main spans
- Daily traffic
- 460
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH 55 Ml over South Platte River is a steel continuous stringer/multi-beam or girder carrying SH 55 Ml over South Platte River in Logan County, Colorado. It was built in 1987, so it is 38 years old, younger than the Colorado average of 42.2 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 460 vehicles a day, roughly 18% of them trucks, projected to reach 833 by 2040. The structure is 180 ft (54.9 m) long and 36 ft wide. If it were closed, the detour would be 16.2 mi (26 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 55 Ml over South Platte River built?
It was built in 1987, making it 38 years old in 2025.
What condition is SH 55 Ml over South Platte River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.
How much traffic does SH 55 Ml over South Platte River carry?
About 460 vehicles per day (2020 count), of which roughly 18% are trucks.
How long is SH 55 Ml over South Platte River?
The structure is 180 ft (54.9 m) long with a longest span of 89 ft (27.1 m) and a deck 36 ft wide.
Who owns SH 55 Ml over South Platte River?
It is owned by the State Highway Agency.