US 59 & Ia 175 over Maple River
Ida County, Iowa · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 59 & Ia 175 over Maple River in Ida County, Iowa, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1989, making it 36 years old at the 2025 inventory.
- It carries about 3,880 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 78 of the 182 inventoried bridges in Ida County rated fair (42.9%); 30 (16.5%) are rated poor.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (42.35125, -95.47866)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Deck | 6 | Satisfactory condition |
| Superstructure | 7 | Good condition |
| Substructure | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 333 ft |
| Location | 1 mi. S of N jct. IA 175 |
| NBI structure number | 000000000029141 |
| Condition class | Fair |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Ida County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 20 over Maple River Overflow | 2016 | 5,100 | Good |
| Moorehead Ave over Odebolt Creek | 2022 | 4,873 | Good |
| Local over Odebolt Creek | 1967 | 2,884 | Poor |
| US 20 EB over Fritz Creek | 2018 | 2,550 | Fair |
| US 20 EB over Maple River | 2017 | 2,550 | Good |
| US 20 WB over Fritz Creek | 2017 | 2,550 | Good |
All bridges nearby: Ida County, IA bridge conditions · every bridge in Ida County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.