County Road 21 over Michigan River
FairJackson County, Colorado · 0.1 MI W of ST HWY 14 · Structure no. 057002100.1023A
- Built
- 1983
- 42 years old
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 51 ft
- 3 main spans
- Daily traffic
- 158
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
County Road 21 over Michigan River is a steel continuous stringer/multi-beam or girder carrying County Road 21 over Michigan River in Jackson County, Colorado. It was built in 1983, so it is 42 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 158 vehicles a day, roughly 24% of them trucks, projected to reach 205 by 2043. The structure is 51 ft (15.5 m) long and 25 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was County Road 21 over Michigan River built?
It was built in 1983, making it 42 years old in 2025.
What condition is County Road 21 over Michigan 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 November 2024.
How much traffic does County Road 21 over Michigan River carry?
About 158 vehicles per day (2023 count), of which roughly 24% are trucks.
How long is County Road 21 over Michigan River?
The structure is 51 ft (15.5 m) long with a longest span of 39 ft (11.9 m) and a deck 25 ft wide.
Who owns County Road 21 over Michigan River?
It is owned by the County Highway Agency.