US-31 over Elk River
Antrim County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US-31 over Elk River in Antrim County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1953, making it 72 years old at the 2025 inventory.
- It carries about 11,959 vehicles a day (traffic count year 2007).
- Its listed owner is the state highway agency.
- It is one of 6 of the 15 inventoried bridges in Antrim County rated fair (40.0%); 2 (13.3%) 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 August 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 → (44.89989, -85.40936)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 139 ft |
| Location | In Elk Rapids |
| NBI structure number | 000000000000359 |
| Condition class | Fair |
| 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 Antrim County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| M-88|n Bridge St over Intermediate River | 1931 | 5,984 | Fair |
| Derenzy Road over Cedar River | 1988 | 3,150 | Good |
| Cayuga Street over Intermediate River | 1977 | 3,000 | Poor |
| Route 593 over Torch River | 1971 | 2,040 | Fair |
| Route 593 over Clam Lake | 1958 | 1,400 | Fair |
| State Street over Intermediate River | 1976 | 900 | Fair |
All bridges nearby: Antrim County, MI bridge conditions · every bridge in Antrim County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.