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Main St over Holly Drain

Shiawassee County, Michigan · rated Poor in the 2025 National Bridge Inventory

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

Main St over Holly Drain in Shiawassee County, Michigan, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
It was built in 1965, making it 60 years old at the 2025 inventory.
It carries about 1,209 vehicles a day (traffic count year 2010).
Its listed owner is a city or municipal highway agency.
It is one of 15 of the 163 inventoried bridges in Shiawassee County rated poor (9.2%); 15 (9.2%) 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.

Component ratings


Structure	Prestressed concrete multiple box beam
Length	about 35 ft
Location	In the Village of Vernon
NBI structure number	000000000009893
Condition class	Poor

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

Bridge	Built	Vehicles/day	Condition
I-69 EB over Looking Glass River	1961	192,000	Fair
I-69 WB over Looking Glass River	1961	192,000	Fair
I-69 EB over Holly Drain	1961	192,000	Fair
I-69 WB over Holly Drain	1961	192,000	Fair
Britton Rd over I-69	1989	25,000	Fair
M-21 over Shiawassee River	1970	22,689	Fair