Ia 21 over Iowa River Overflow
FairBenton County, Iowa · 1.6 Mi. N of Jct. Ia 212 · Structure no. 000000000014401
- Built
- 1982
- 43 years old
- Condition
- Fair
- inspected March 2024
- Type
- Slab
- Concrete Continuous
- Length
- 204 ft
- 5 main spans
- Daily traffic
- 2,710
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Ia 21 over Iowa River Overflow is a concrete continuous slab carrying Ia 21 over Iowa River Overflow in Benton County, Iowa. It was built in 1982, so it is 43 years old, younger than the Iowa average of 45.5 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 2,710 vehicles a day, roughly 12% of them trucks, projected to reach 2,710 by 2042. The structure is 204 ft (62.2 m) long and 48 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ia 21 over Iowa River Overflow built?
It was built in 1982, making it 43 years old in 2025.
What condition is Ia 21 over Iowa River Overflow 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 March 2024.
How much traffic does Ia 21 over Iowa River Overflow carry?
About 2,710 vehicles per day (2022 count), of which roughly 12% are trucks.
How long is Ia 21 over Iowa River Overflow?
The structure is 204 ft (62.2 m) long with a longest span of 44 ft (13.4 m) and a deck 48 ft wide.
Who owns Ia 21 over Iowa River Overflow?
It is owned by the State Highway Agency.