Irr Bia Rte 1 over Drainage to Shunk Creek
Chippewa County, Michigan · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Irr Bia Rte 1 over Drainage to Shunk Creek in Chippewa 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 2002, making it 23 years old at the 2025 inventory.
- It carries about 60 vehicles a day (traffic count year 2023).
- It is one of 26 of the 112 inventoried bridges in Chippewa County rated good (23.2%); 13 (11.6%) 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 August 2023, on a 24-month routine inspection cycle.
- 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 → (46.47161, -84.31741)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 8 | 8 | Very good condition |
Bridge details
| Structure | Concrete culvert |
| Length | about 20 ft |
| Location | Sault Ste Marie Res. |
| NBI structure number | 00000000000F507 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Chippewa County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-75 BS|3 Mile Rd over I-75 NB | 1962 | 15,700 | Fair |
| I-75 Bs (ashmun) over Power Canal | 1934 | 10,180 | Fair |
| Easterday Ave. over Ashmun Creek | 1994 | 8,347 | Good |
| Easterday Ave over I-75 NB | 1962 | 7,774 | Fair |
| West Portage Ave. over Power Canal | 1970 | 7,637 | Fair |
| Spruce St. over Power Canal | 1983 | 5,995 | Fair |
All bridges nearby: Chippewa County, MI bridge conditions · every bridge in Chippewa County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.