O Avenue over Portage River
Kalamazoo County, Michigan · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- O Avenue over Portage River in Kalamazoo County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 7 (good condition) on the 0-9 scale.
- It was built in 2014, making it 11 years old at the 2025 inventory.
- It carries about 200 vehicles a day (traffic count year 2014).
- Its listed owner is the county highway agency.
- It is one of 65 of the 152 inventoried bridges in Kalamazoo County rated good (42.8%); 11 (7.2%) are rated poor.
- 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 → (42.23037, -85.40976)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 7 | Good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 23 ft |
| Location | 0.25 Mi E of 36TH Street |
| NBI structure number | 000000000013830 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Kalamazoo County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-94 over Norfolk Southern | 2022 | 67,300 | Good |
| I-94 over Portage Road | 2022 | 67,300 | Good |
| US-131 (mot) over Amtrak & Kl Ave | 2024 | 48,600 | Good |
| I-94 EB & Cd Ramp over US-131 NB | 2008 | 39,044 | Good |
| I-94 WB over US-131 NB | 2007 | 39,044 | Good |
| I-94 Bl (stadium) over US-131 | 2015 | 36,361 | Fair |
All bridges nearby: Kalamazoo County, MI bridge conditions · every bridge in Kalamazoo County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.