Mill Lake Boat Launch sits in a corner of Parry Sound on the northeast side of the Highway 400 bridges that cross the Seguin River, accessed via the end of Hall's Quarry Road.

The ramp provides access to Mill Lake, a smaller, self-contained lake that does not connect to Georgian Bay or other area lakes. The launch is shallow with a gravel base, making it well suited to the smaller watercraft appropriate for this lake.

Commercial use of the ramp requires a permit from the Town of Parry Sound Public Works department. Overnight parking permits are available for purchase separately.