Base Line Road over John Neff Drain
Isabella County, Michigan · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Base Line Road over John Neff Drain in Isabella County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 8 (very good condition) on the 0-9 scale.
- It was built in 2009, making it 16 years old at the 2025 inventory.
- It carries about 427 vehicles a day (traffic count year 2004).
- Its listed owner is the county highway agency.
- It is one of 85 of the 183 inventoried bridges in Isabella County rated good (46.4%); 26 (14.2%) 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 → (43.64056, -84.76778)
Component ratings
| Component | Rating (2025) | FHWA scale meaning |
|---|---|---|
| Culvert | 8 | Very good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 27 ft |
| Location | 50 Ft E of Mission Rd |
| NBI structure number | 000000000004281 |
| Condition class | Good |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Isabella County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Pickard Avenue over Chippewa River | 1979 | 16,211 | Fair |
| M-20 over Chippewa River | 1996 | 10,842 | Good |
| US-127 NB over Little Salt River | 1961 | 10,457 | Fair |
| US-127 SB over Little Salt River | 1961 | 10,457 | Fair |
| Mission Road over Ann Arbor Railroad | 2005 | 9,200 | Good |
| Mission Road over North Br Chippewa River | 2008 | 9,019 | Good |
All bridges nearby: Isabella County, MI bridge conditions · every bridge in Isabella County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.