Six Mile Bay is a recreation site and water-access point on Williston Lake (Williston Reservoir) in the Parsnip Reach, located roughly 45–50 minutes by road from Mackenzie, B. C.

It is reached via the Parsnip West Forest Service Road, turning west at the 41 km marker onto an approximately 1 km dirt access road.

The site includes 17 camp stalls with picnic tables, three outhouses, and a large gravel area that serves as both parking and an informal boat launch.

Usable space for launching and camping shifts with reservoir elevation — more room is available at lower water levels, while higher water levels reduce the area. The parking area is notably spacious, with room for 40–50 vehicles.

BC Hydro notes that access here is suited for car-top boats only, and the site is not maintained by BC Hydro.