Gresham Hwy over Thornapple River
Eaton County, Michigan · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Gresham Hwy over Thornapple River in Eaton County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 3 (serious condition) on the 0-9 scale.
- It was built in 1953, making it 72 years old at the 2025 inventory.
- It carries about 77 vehicles a day (traffic count year 2011).
- Its listed owner is the county highway agency.
- It is one of 11 of the 202 inventoried bridges in Eaton County rated poor (5.4%); 11 (5.4%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated July 2024, on a 12-month routine inspection cycle.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (42.64077, -84.95584)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 3 | 3 | Serious condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Timber |
| Length | about 52 ft |
| Location | 3 Mi E of Vermontville |
| NBI structure number | 000000000002389 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | July 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | U: unknown foundation, not evaluated for scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Eaton County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-96 WB over Grand Riv & Billwood Hwy | 2023 | 47,900 | Good |
| I-96 EB over M-43 | 1962 | 31,250 | Fair |
| I-96 WB over M-43 | 1962 | 31,250 | Fair |
| Otto Road over I-69 | 1989 | 27,800 | Fair |
| I-96 EB over Grand River | 1962 | 27,100 | Fair |
| I-96 WB over Grand River | 1962 | 27,100 | Fair |
All bridges nearby: Eaton County, MI bridge conditions · every bridge in Eaton County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.