Buttermilk Creek begins in a field north of Petrolia and travels 5 kilometres (3.1 mi) through the northwest of the town before reaching its mouth at the Stonehouse Drain in Lorne C Henderson Conservation Area.

The Stonehouse Drain flows via Bear Creek and the North Sydenham and Sydenham Rivers into Lake St. Clair.

Buttermilk Creek is part of the St. Clair Region Conservation Authority's Lower Bear Watershed.

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