US-23 NB over Shiawassee River
Genesee County, Michigan · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US-23 NB over Shiawassee River in Genesee County, Michigan, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1957, making it 68 years old at the 2025 inventory.
- It carries about 28,525 vehicles a day (traffic count year 2019).
- Its listed owner is the state highway agency.
- It is one of 227 of the 369 inventoried bridges in Genesee County rated fair (61.5%); 53 (14.4%) 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 March 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 → (42.8153, -83.72584)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 41 ft |
| Location | In Fenton |
| NBI structure number | 000000000002467 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 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 Genesee County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-69 over CSX RR | 1971 | 96,200 | Fair |
| I-69 EB over M-54|s Dort Hwy | 2015 | 96,200 | Fair |
| I-69 over Gtw RR | 1971 | 93,000 | Fair |
| I-75 NB over Bristol Rd | 2005 | 89,742 | Fair |
| I-75 NB over Flushing Rd | 1958 | 76,600 | Fair |
| I-75 SB over Flushing Rd | 1958 | 76,600 | Fair |
All bridges nearby: Genesee County, MI bridge conditions · every bridge in Genesee County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.