Ia 21 over Branch Salt Creek
GoodBenton County, Iowa · 0.8 Mi. S of Jct. SR E36 · Structure no. 000000000014431
- Built
- 1979
- 46 years old
- Condition
- Good
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 189 ft
- 3 main spans
- Daily traffic
- 1,470
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Ia 21 over Branch Salt Creek is a prestressed concrete stringer/multi-beam or girder carrying Ia 21 over Branch Salt Creek in Benton County, Iowa. It was built in 1979, so it is 46 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 1,470 vehicles a day, roughly 24% of them trucks, projected to reach 1,470 by 2042. The structure is 189 ft (57.6 m) long and 47 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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| 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 Branch Salt Creek built?
It was built in 1979, making it 46 years old in 2025.
What condition is Ia 21 over Branch Salt Creek 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 2023.
How much traffic does Ia 21 over Branch Salt Creek carry?
About 1,470 vehicles per day (2022 count), of which roughly 24% are trucks.
How long is Ia 21 over Branch Salt Creek?
The structure is 189 ft (57.6 m) long with a longest span of 82 ft (25 m) and a deck 47 ft wide.
Who owns Ia 21 over Branch Salt Creek?
It is owned by the State Highway Agency.