M-115 over Betsie River
Manistee County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- M-115 over Betsie River in Manistee County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1940 and reconstructed in 2003, making it 85 years old at the 2025 inventory.
- It carries about 4,219 vehicles a day (traffic count year 2019).
- Its listed owner is the state highway agency.
- It is one of 18 of the 35 inventoried bridges in Manistee County rated fair (51.4%); 5 (14.3%) 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 October 2023, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (44.5074, -85.96836)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 149 ft |
| Location | 0.6 Mi SE of Benzie Col |
| NBI structure number | 000000000006444 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | October 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 Manistee County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-31 over Manistee River | 1933 | 17,789 | Fair |
| M-55 over Pine Creek | 1932 | 4,202 | Fair |
| M-55 over Manistee River | 2021 | 3,408 | Good |
| M-55 over Pine River | 1934 | 3,175 | Fair |
| East Lake Road over Little Manistee River | 1964 | 3,000 | Fair |
| M-115 over Dutchman Creek | 1937 | 2,670 | Fair |
All bridges nearby: Manistee County, MI bridge conditions · every bridge in Manistee County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.