1st ST over Drainage
PoorClosed to trafficAudubon County, Iowa · D60500515 · Structure no. 000000000005650
- Built
- 1930
- 95 years old
- Condition
- Poor
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 66 ft
- 3 main spans
- Daily traffic
- 9
- 2022 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
1st ST over Drainage is a wood or timber stringer/multi-beam or girder carrying 1st ST over Drainage in Audubon County, Iowa. It was built in 1930, so it is 95 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 2 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. Its operating status is: closed to all traffic.
It carries about 9 vehicles a day, projected to reach 9 by 2043. The structure is 66 ft (20.1 m) long and 16 ft wide. If it were closed, the detour would be 123 mi (198 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 2 Critical | Advanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken. |
| Channel and channel protection | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 1st ST over Drainage built?
It was built in 1930, making it 95 years old in 2025.
What condition is 1st ST over Drainage 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 1st ST over Drainage carry?
About 9 vehicles per day (2022 count).
How long is 1st ST over Drainage?
The structure is 66 ft (20.1 m) long with a longest span of 23 ft (7 m) and a deck 16 ft wide.
Who owns 1st ST over Drainage?
It is owned by the City or Municipal Highway Agency.