US-23 SB over I-75 NB
Arenac County, Michigan · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US-23 SB over I-75 NB in Arenac County, Michigan, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1968, making it 57 years old at the 2025 inventory.
- It carries about 4,566 vehicles a day (traffic count year 2007).
- Its listed owner is the state highway agency.
- It is one of 25 of the 80 inventoried bridges in Arenac County rated good (31.2%); 12 (15.0%) 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 5 to 7, superstructure 6 to 7, substructure 6 to 8).
- Its most recent inspection on record is dated June 2024, on a 24-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 → (43.94894, -84.01401)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 7 | Good condition |
| Superstructure | 6 | 7 | Good condition |
| Substructure | 6 | 8 | Very good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 338 ft |
| Location | 5.0 Mi SW of Standish |
| NBI structure number | 000000000000421 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2024 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | N: not over a waterway |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.
Busiest bridges in Arenac County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-75 Nb|us-23 NB over Sunsmith Drain | 1968 | 27,470 | Fair |
| US-23|MAIN St over Middle Br Pine River | 1994 | 14,971 | Fair |
| Sterling Road over I-75 NB | 1968 | 14,350 | Poor |
| I-75 Sb|us-23 SB over S Br Pine River | 1968 | 13,735 | Fair |
| I-75 Nb|us-23 NB over S Br Pine River | 1968 | 13,735 | Fair |
| US-23|W Huron Rd over N Br Pine River | 2001 | 9,170 | Good |
All bridges nearby: Arenac County, MI bridge conditions · every bridge in Arenac County · Michigan bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.