NW 128th ST SB over Walnut Creek
GoodPolk County, Iowa · 079253200 · Structure no. 000000000504415
- Built
- 1998
- 27 years old
- Condition
- Good
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 247 ft
- 3 main spans
- Daily traffic
- 7,065
- 2021 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
NW 128th ST SB over Walnut Creek is a prestressed concrete stringer/multi-beam or girder carrying NW 128th ST SB over Walnut Creek in Polk County, Iowa. It was built in 1998, so it is 27 years old, younger than the Iowa average of 45.5 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 7,065 vehicles a day, roughly 1% of them trucks, projected to reach 7,065 by 2043. The structure is 247 ft (75.4 m) long and 40 ft wide.
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was NW 128th ST SB over Walnut Creek built?
It was built in 1998, making it 27 years old in 2025.
What condition is NW 128th ST SB over Walnut Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.
How much traffic does NW 128th ST SB over Walnut Creek carry?
About 7,065 vehicles per day (2021 count), of which roughly 1% are trucks.
How long is NW 128th ST SB over Walnut Creek?
The structure is 247 ft (75.4 m) long with a longest span of 82 ft (25 m) and a deck 40 ft wide.
Who owns NW 128th ST SB over Walnut Creek?
It is owned by the City or Municipal Highway Agency.