Washington Ave over Pere Marquette Lk Bayou
Mason County, Michigan · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Washington Ave over Pere Marquette Lk Bayou in Mason 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 2013, making it 12 years old at the 2025 inventory.
- It carries about 6,340 vehicles a day (traffic count year 2012).
- Its listed owner is a city or municipal highway agency.
- It is one of 21 of the 66 inventoried bridges in Mason County rated good (31.8%); 4 (6.1%) 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 September 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 → (43.94761, -86.43941)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Prestressed concrete single box beam |
| Length | about 210 ft |
| Location | In Ludington |
| NBI structure number | 000000000006690 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | September 2023 |
| 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 Mason County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Old US-31 over CSX RR | 1935 | 11,200 | Good |
| Old US-31 over Durham Creek | 1925 | 8,600 | Fair |
| Old US-31 over Pere Marquette River | 1925 | 7,076 | Fair |
| Old US-31 over Pere Marquette River | 1924 | 6,828 | Fair |
| US-31 over S Br Lincoln River | 1992 | 6,578 | Fair |
| US-31 over N Br Lincoln River | 1992 | 6,578 | Fair |
All bridges nearby: Mason County, MI bridge conditions · every bridge in Mason County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.