NB I-29 over ST Marys Creek
GoodMills County, Iowa · 0.9 Mi. S of Jct. Ia 370 · Structure no. 000000000036371
- Built
- 2009
- 16 years old
- Condition
- Good
- inspected December 2023
- Type
- Slab
- Concrete Continuous
- Length
- 123 ft
- 3 main spans
- Daily traffic
- 9,850
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
NB I-29 over ST Marys Creek is a concrete continuous slab carrying NB I-29 over ST Marys Creek in Mills County, Iowa. It was built in 2009, so it is 16 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 9,850 vehicles a day, roughly 25% of them trucks, projected to reach 9,850 by 2043. The structure is 123 ft (37.5 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
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 | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was NB I-29 over ST Marys Creek built?
It was built in 2009, making it 16 years old in 2025.
What condition is NB I-29 over ST Marys 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 December 2023.
How much traffic does NB I-29 over ST Marys Creek carry?
About 9,850 vehicles per day (2022 count), of which roughly 25% are trucks.
How long is NB I-29 over ST Marys Creek?
The structure is 123 ft (37.5 m) long with a longest span of 47 ft (14.3 m) and a deck 43 ft wide.
Who owns NB I-29 over ST Marys Creek?
It is owned by the State Highway Agency.