B25 Chestnut St over Cota Creek
Allamakee County, Iowa · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- B25 Chestnut St over Cota Creek in Allamakee County, Iowa, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2021, making it 4 years old at the 2025 inventory.
- It carries about 420 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 62 of the 197 inventoried bridges in Allamakee County rated good (31.5%); 21 (10.7%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated April 2024, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (43.20244, -91.15618)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete stringer or multi-beam girder |
| Length | about 109 ft |
| Location | 0.1 mi W great river rd |
| NBI structure number | 000000000005971 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 9: foundations on dry land well above flood elevations |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Iowa department of transportation.
Busiest bridges in Allamakee County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ia 9 over Stream | 1967 | 3,670 | Fair |
| Ia 51 over Hecher Creek | 1967 | 2,690 | Good |
| Ia 51 over Yellow River | 1967 | 2,690 | Good |
| Front St over Clear Creek | 1985 | 2,418 | Good |
| Ia 76 over Yellow River | 1980 | 2,370 | Fair |
| Ia 76 over Drainage Ditch | 1996 | 2,370 | Good |
All bridges nearby: Allamakee County, IA bridge conditions · every bridge in Allamakee County · Iowa bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.