170th St. over Drainage
GoodClinton County, Iowa · 082E20801 · Structure no. 000000000123141
- Built
- 1991
- 34 years old
- Condition
- Good
- inspected April 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 35 ft
- 1 main span
- Daily traffic
- 21
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
170th St. over Drainage is a prestressed concrete tee beam carrying 170th St. over Drainage in Clinton County, Iowa. It was built in 1991, so it is 34 years old, younger than the Iowa average of 45.5 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 21 vehicles a day, projected to reach 21 by 2044. The structure is 35 ft (10.7 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 170th St. over Drainage built?
It was built in 1991, making it 34 years old in 2025.
What condition is 170th St. over Drainage 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 April 2024.
How much traffic does 170th St. over Drainage carry?
About 21 vehicles per day (2022 count).
How long is 170th St. over Drainage?
The structure is 35 ft (10.7 m) long with a longest span of 34 ft (10.4 m) and a deck 24 ft wide.
Who owns 170th St. over Drainage?
It is owned by the County Highway Agency.