M21 W Ave over Branch Maple River
PoorCherokee County, Iowa · 091390202 · Structure no. 000000000107790
- Built
- 1970
- 55 years old
- Condition
- Poor
- inspected August 2023
- Type
- Slab
- Concrete Continuous
- Length
- 77 ft
- 3 main spans
- Daily traffic
- 369
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
M21 W Ave over Branch Maple River is a concrete continuous slab carrying M21 W Ave over Branch Maple River in Cherokee County, Iowa. It was built in 1970, so it is 55 years old, older than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 369 vehicles a day, roughly 12% of them trucks, projected to reach 369 by 2043. The structure is 77 ft (23.5 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was M21 W Ave over Branch Maple River built?
It was built in 1970, making it 55 years old in 2025.
What condition is M21 W Ave over Branch Maple River in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.
How much traffic does M21 W Ave over Branch Maple River carry?
About 369 vehicles per day (2022 count), of which roughly 12% are trucks.
How long is M21 W Ave over Branch Maple River?
The structure is 77 ft (23.5 m) long with a longest span of 29 ft (8.8 m) and a deck 30 ft wide.
Who owns M21 W Ave over Branch Maple River?
It is owned by the County Highway Agency.