Walnut ST over Des Moines River
PoorPolk County, Iowa · 078240400 · Structure no. 000000000003700
- Built
- 1911
- 114 years old, rebuilt 1966
- Condition
- Poor
- inspected August 2023
- Type
- Arch - Deck
- Concrete Continuous
- Length
- 503 ft
- 6 main spans
- Daily traffic
- 3,844
- 2022 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Walnut ST over Des Moines River is a concrete continuous arch - deck carrying Walnut ST over Des Moines River in Polk County, Iowa. It was built in 1911 and reconstructed in 1966, so it is 114 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 3 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 3,844 vehicles a day, projected to reach 3,844 by 2043. The structure is 503 ft (153.3 m) long and 85 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 Walnut ST over Des Moines River built?
It was built in 1911, making it 114 years old in 2025. It was reconstructed in 1966.
What condition is Walnut ST over Des Moines 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 Walnut ST over Des Moines River carry?
About 3,844 vehicles per day (2022 count).
How long is Walnut ST over Des Moines River?
The structure is 503 ft (153.3 m) long with a longest span of 75 ft (22.9 m) and a deck 85 ft wide.
Who owns Walnut ST over Des Moines River?
It is owned by the City or Municipal Highway Agency.