Sixth Street over Grand River
Kent County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Sixth Street over Grand River in Kent County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1886 and reconstructed in 2011, making it 139 years old at the 2025 inventory.
- It carries about 4,550 vehicles a day (traffic count year 2011).
- Its listed owner is a city or municipal highway agency.
- It is one of 317 of the 524 inventoried bridges in Kent County rated fair (60.5%); 29 (5.5%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its class is unchanged from 2024 (fair), but component ratings moved: substructure 6 to 5.
- Its most recent inspection on record is dated August 2024, on a 12-month routine inspection cycle.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- 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 → (42.97662, -85.67331)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 5 | Fair condition |
Bridge details
| Structure | Steel through truss |
| Length | about 544 ft |
| Location | Grand Rapids |
| NBI structure number | 000000000005192 |
| Condition class | Fair |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Kent County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-131 over CSX RR | 1962 | 103,312 | Fair |
| I-196 & Ramp G over Gtw RR (abn) | 1964 | 69,092 | Good |
| US-131 SB over Grand River & Fulton St | 1999 | 67,975 | Fair |
| US-131 over Buck Creek | 2000 | 61,220 | Good |
| US-131 over Conrail | 2000 | 61,220 | Fair |
| US-131 NB over Rogue River | 1969 | 58,420 | Fair |
All bridges nearby: Kent County, MI bridge conditions · every bridge in Kent County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.