Ia 21 over South Skunk River
FairKeokuk County, Iowa · 1.0 Mi. S of SR G-48 · Structure no. 000000000211161
- Built
- 1989
- 36 years old
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 482 ft
- 5 main spans
- Daily traffic
- 630
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Ia 21 over South Skunk River is a prestressed concrete stringer/multi-beam or girder carrying Ia 21 over South Skunk River in Keokuk County, Iowa. It was built in 1989, so it is 36 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 630 vehicles a day, roughly 25% of them trucks, projected to reach 630 by 2044. The structure is 482 ft (146.9 m) long and 43 ft wide. If it were closed, the detour would be 34.2 mi (55 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ia 21 over South Skunk River built?
It was built in 1989, making it 36 years old in 2025.
What condition is Ia 21 over South Skunk River 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 August 2024.
How much traffic does Ia 21 over South Skunk River carry?
About 630 vehicles per day (2022 count), of which roughly 25% are trucks.
How long is Ia 21 over South Skunk River?
The structure is 482 ft (146.9 m) long with a longest span of 97 ft (29.6 m) and a deck 43 ft wide.
Who owns Ia 21 over South Skunk River?
It is owned by the State Highway Agency.