Mason Road over S Br Shiawassee River
Livingston County, Michigan · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Mason Road over S Br Shiawassee River in Livingston County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 8 (very good condition) on the 0-9 scale.
- It was built in 1986 and reconstructed in 2022, making it 39 years old at the 2025 inventory.
- It carries about 2,760 vehicles a day (traffic count year 2020).
- Its listed owner is the county highway agency.
- It is one of 47 of the 165 inventoried bridges in Livingston County rated good (28.5%); 23 (13.9%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated fair in the 2024 inventory and is now good (deck 6 to 8).
- Its most recent inspection on record is dated April 2024, on a 16-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 → (42.60001, -83.96361)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 8 | Very good condition |
| Superstructure | 9 | 9 | Excellent condition |
| Substructure | 8 | 8 | Very good condition |
Bridge details
| Structure | Steel single box beam |
| Length | about 35 ft |
| Location | Sec 34 Howell Twp |
| NBI structure number | 000000000005816 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | April 2024 |
| Inspection interval (item 91) | 16 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 Livingston County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US-23 over M-36 | 1960 | 64,800 | Poor |
| I-96 WB Cd over US-23 SB | 2016 | 51,600 | Good |
| I-96 WB over US-23 SB | 2015 | 51,600 | Fair |
| I-96 EB over US-23 NB | 2015 | 51,600 | Fair |
| I-96 WB over US-23 NB | 2015 | 51,600 | Fair |
| I-96 EB Cd over US-23 SB | 2016 | 51,588 | Good |
All bridges nearby: Livingston County, MI bridge conditions · every bridge in Livingston County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.