N Twentieth St over Kalamazoo River
Calhoun County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- N Twentieth St over Kalamazoo River in Calhoun County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1963 and reconstructed in 1985, making it 62 years old at the 2025 inventory.
- It carries about 6,500 vehicles a day (traffic count year 2022).
- Its listed owner is a city or municipal highway agency.
- It is one of 133 of the 213 inventoried bridges in Calhoun County rated fair (62.4%); 37 (17.4%) 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 November 2023, on a 24-month routine inspection cycle.
- 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 → (42.3348, -85.21941)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Prestressed concrete multiple box beam |
| Length | about 334 ft |
| Location | 0.2 Mi S of Michigan Ave |
| NBI structure number | 000000000001401 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | November 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Calhoun County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-94 Bl & M-37 over I-94 | 2015 | 121,987 | Fair |
| I-94 EB over Riverside Drive | 2009 | 25,840 | Fair |
| I-94 WB over Riverside Drive | 2009 | 25,840 | Fair |
| I-194 over Kalamazoo River | 1966 | 24,600 | Fair |
| I-194 over Gtw RR | 1966 | 24,600 | Fair |
| I-194 over Conrail (abn) | 1966 | 24,600 | Fair |
All bridges nearby: Calhoun County, MI bridge conditions · every bridge in Calhoun County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.