I-35 over Drainage Ditch 23 & 31
GoodHamilton County, Iowa · 1.0 Mile N of JCT SR D20 · Structure no. 000000000603890
- Built
- 1972
- 53 years old
- Condition
- Good
- inspected March 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 21 ft
- 2 main spans
- Daily traffic
- 16,600
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
I-35 over Drainage Ditch 23 & 31 is a concrete continuous culvert carrying I-35 over Drainage Ditch 23 & 31 in Hamilton County, Iowa. It was built in 1972, so it is 53 years old, older 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 16,600 vehicles a day, roughly 28% of them trucks, projected to reach 16,600 by 2043. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.2 mi (2 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 |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-35 over Drainage Ditch 23 & 31 built?
It was built in 1972, making it 53 years old in 2025.
What condition is I-35 over Drainage Ditch 23 & 31 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 March 2024.
How much traffic does I-35 over Drainage Ditch 23 & 31 carry?
About 16,600 vehicles per day (2023 count), of which roughly 28% are trucks.
How long is I-35 over Drainage Ditch 23 & 31?
The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).
Who owns I-35 over Drainage Ditch 23 & 31?
It is owned by the State Highway Agency.