Crawford Lake Conservation Area, Protected conservation area in Milton, Canada.

Crawford Lake Conservation Area is a protected landscape near Campbellville in Milton, Ontario, with a meromictic lake, a reconstructed fifteenth-century Iroquoian village of three longhouses and a palisade, and 19 kilometres of trails. A boardwalk circles the lake, whose dark surface can hold broken ice in cold weather, and paths link to the Bruce Trail.

Pollen analysis of the lake sediments in 1971 revealed corn pollen, pointing to an Iroquoian settlement nearby. A grindstone found in the area led archaeologists to the foundations of an eleven-longhouse village south of the lake, occupied in the fifteenth century by Wendat or Neutral peoples. The village has been reconstructed on the site.

Three reconstructed longhouses show how Iroquoian families lived here, with traditional fireplaces and sleeping areas to explore. Visitors can see how people built their homes and organized daily life centuries ago.

The area offers over 19 kilometers of marked trails for hiking in summer and snowshoeing in winter, with connections to the Bruce Trail. Paths vary in difficulty, so visitors of different abilities can find routes that suit them.

The lake has distinct water layers that never mix, preserving sediments that record hundreds of years of environmental changes in order. This layering acts like a historical record, allowing scientists to read the natural history of the place as if turning pages.