County Road 421 over Tahquamenon River
Luce County, Michigan · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Road 421 over Tahquamenon River in Luce County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1967, making it 58 years old at the 2025 inventory.
- It carries about 20 vehicles a day (traffic count year 2016).
- Its listed owner is the county highway agency.
- It is one of 4 of the 28 inventoried bridges in Luce County rated poor (14.3%); 4 (14.3%) 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 October 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 → (46.45023, -85.80851)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 4 | 4 | Poor condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 23 ft |
| Location | Eagles Nest Camp |
| NBI structure number | 000000000005924 |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | October 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 Luce County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| M-28 over E Br Teaspoon Creek | 1993 | 3,756 | Fair |
| M-28 over W Br Sage River | 2001 | 2,127 | Fair |
| M-28 over E Br Sage River | 1959 | 2,127 | Fair |
| M-28 over E Br Fox River | 1989 | 1,763 | Fair |
| Dollarville Road over Teaspoon Creek | 1951 | 1,700 | Fair |
| County Rd 98 over Helmer Creek | 2005 | 1,200 | Good |
All bridges nearby: Luce County, MI bridge conditions · every bridge in Luce County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.