So Main ST over Cascade Landing
PoorClosed to trafficDes Moines County, Iowa · 000000000 · Structure no. 000000000000900
- Built
- 1896
- 129 years old, rebuilt 1960
- Condition
- Poor
- inspected August 2008
- Type
- Truss - Deck
- Steel
- Length
- 464 ft
- 4 main spans
- Daily traffic
- 743
- 2022 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
So Main ST over Cascade Landing is a steel truss - deck carrying So Main ST over Cascade Landing in Des Moines County, Iowa. It was built in 1896 and reconstructed in 1960, so it is 129 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 743 vehicles a day, projected to reach 743 by 2043. The structure is 464 ft (141.4 m) long and 40 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 | 7 Good | Some minor problems. |
| Superstructure | 2 Critical | Advanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was So Main ST over Cascade Landing built?
It was built in 1896, making it 129 years old in 2025. It was reconstructed in 1960.
What condition is So Main ST over Cascade Landing 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 2008.
How much traffic does So Main ST over Cascade Landing carry?
About 743 vehicles per day (2022 count).
How long is So Main ST over Cascade Landing?
The structure is 464 ft (141.4 m) long with a longest span of 160 ft (48.8 m) and a deck 40 ft wide.
Who owns So Main ST over Cascade Landing?
It is owned by the City or Municipal Highway Agency.