US-31 SB over Pigeon River
Ottawa County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US-31 SB over Pigeon River in Ottawa County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the superstructure, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1958, making it 67 years old at the 2025 inventory.
- It carries about 11,630 vehicles a day (traffic count year 2007).
- Its listed owner is the state highway agency.
- It is one of 151 of the 253 inventoried bridges in Ottawa County rated fair (59.7%); 23 (9.1%) 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 April 2024, 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 → (42.9159, -86.1445)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 54 ft |
| Location | 4.4 Mi SE of M-45 |
| NBI structure number | 000000000008692 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| 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 Ottawa County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Taft Rd over US-31 | 1958 | 281,500 | Fair |
| US-31 over Grand River M-104 Conn | 1960 | 66,750 | Fair |
| US-31 over Gtw RR & M-104 | 1959 | 44,375 | Fair |
| US-31 over 3RD St (m-104) | 1958 | 44,375 | Fair |
| I-96 over Br of Sand Creek | 1961 | 36,338 | Good |
| I-96 EB over Deer Creek | 1958 | 36,000 | Fair |
All bridges nearby: Ottawa County, MI bridge conditions · every bridge in Ottawa County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.