170th ST over Plum Creek
PoorDelaware County, Iowa · 089040703 · Structure no. 000000000009010
- Built
- 1949
- 76 years old
- Condition
- Poor
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 42 ft
- 1 main span
- Daily traffic
- 275
- 2022 count
- Owner
- County
- County Highway Agency
About this bridge
170th ST over Plum Creek is a steel stringer/multi-beam or girder carrying 170th ST over Plum Creek in Delaware County, Iowa. It was built in 1949, so it is 76 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 275 vehicles a day, roughly 19% of them trucks, projected to reach 275 by 2043. The structure is 42 ft (12.8 m) long and 25 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 170th ST over Plum Creek built?
It was built in 1949, making it 76 years old in 2025.
What condition is 170th ST over Plum Creek 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 May 2023.
How much traffic does 170th ST over Plum Creek carry?
About 275 vehicles per day (2022 count), of which roughly 19% are trucks.
How long is 170th ST over Plum Creek?
The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 25 ft wide.
Who owns 170th ST over Plum Creek?
It is owned by the County Highway Agency.