Plank Road over Beaubien Creek Drain

St. Clair County, Michigan · rated Poor in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

• Plank Road over Beaubien Creek Drain in St. Clair County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
• Its lowest-rated component is the culvert, rated 4 (poor condition) on the 0-9 scale.
• It was built in 1988, making it 37 years old at the 2025 inventory.
• It carries about 250 vehicles a day (traffic count year 1994).
• Its listed owner is the county highway agency.
• It is one of 31 of the 326 inventoried bridges in St. Clair County rated poor (9.5%); 31 (9.5%) are rated poor.
• A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

View this bridge on a map → (42.71818, -82.57973)

Component ratings

Bridge details

Source: FHWA National Bridge Inventory, 2025 data as reported by the Michigan department of transportation.

Busiest bridges in St. Clair County

All bridges nearby: St. Clair County, MI bridge conditions · every bridge in St. Clair County · Michigan bridges.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.