Is 55 N over Rock CR
GoodJefferson County, Missouri · S 2024 T 42 N R 6 E · Structure no. 12035
- Built
- 2001
- 24 years old
- Condition
- Good
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 198 ft
- 3 main spans
- Daily traffic
- 62,884
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Is 55 N over Rock CR is a prestressed concrete continuous stringer/multi-beam or girder carrying Is 55 N over Rock CR in Jefferson County, Missouri. It was built in 2001, so it is 24 years old, younger than the Missouri average of 45.1 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 62,884 vehicles a day, roughly 18% of them trucks, projected to reach 116,335 by 2044. The structure is 198 ft (60.4 m) long and 81 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Is 55 N over Rock CR built?
It was built in 2001, making it 24 years old in 2025.
What condition is Is 55 N over Rock CR 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 November 2024.
How much traffic does Is 55 N over Rock CR carry?
About 62,884 vehicles per day (2024 count), of which roughly 18% are trucks.
How long is Is 55 N over Rock CR?
The structure is 198 ft (60.4 m) long with a longest span of 75 ft (22.8 m) and a deck 81 ft wide.
Who owns Is 55 N over Rock CR?
It is owned by the State Highway Agency.