M-13|n Huron Rd over Pinconning River
Bay County, Michigan · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- M-13|n Huron Rd over Pinconning River in Bay County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 2009, making it 16 years old at the 2025 inventory.
- It carries about 9,924 vehicles a day (traffic count year 2007).
- Its listed owner is the state highway agency.
- It is one of 46 of the 166 inventoried bridges in Bay County rated good (27.7%); 27 (16.3%) 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 April 2024, 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 → (43.85832, -83.96613)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Prestressed concrete single box beam |
| Length | about 48 ft |
| Location | In Pinconning |
| NBI structure number | 000000000000592 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Bay County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-75 NB over Squaconning Creek | 1960 | 57,600 | Fair |
| I-75 SB over Squaconning Creek | 1960 | 57,600 | Fair |
| I-75 NB over Goetz Drain | 2010 | 53,002 | Good |
| I-75 NB over Hesr | 1960 | 44,350 | Poor |
| US-10 EB over Gtw RR | 1961 | 35,800 | Fair |
| US-10 WB over Gtw RR | 1961 | 35,800 | Fair |
All bridges nearby: Bay County, MI bridge conditions · every bridge in Bay County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.