Ia 21 over Deep River
GoodPoweshiek County, Iowa · 1.0 Mi. N of Jct. Ia 85 · Structure no. 000000000045890
- Built
- 1962
- 63 years old
- Condition
- Good
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 166 ft
- 3 main spans
- Daily traffic
- 1,730
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Ia 21 over Deep River is a prestressed concrete stringer/multi-beam or girder carrying Ia 21 over Deep River in Poweshiek County, Iowa. It was built in 1962, so it is 63 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 1,730 vehicles a day, roughly 14% of them trucks, projected to reach 1,730 by 2044. The structure is 166 ft (50.6 m) long and 36 ft wide. If it were closed, the detour would be 9.9 mi (16 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 Ia 21 over Deep River built?
It was built in 1962, making it 63 years old in 2025.
What condition is Ia 21 over Deep 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 2024.
How much traffic does Ia 21 over Deep River carry?
About 1,730 vehicles per day (2022 count), of which roughly 14% are trucks.
How long is Ia 21 over Deep River?
The structure is 166 ft (50.6 m) long with a longest span of 69 ft (21 m) and a deck 36 ft wide.
Who owns Ia 21 over Deep River?
It is owned by the State Highway Agency.