Deer Lake and the surrounding park is a highly altered habitat.
The vegetation natural to the area is temperate rainforest dominated by conifers such as Tsuga heterophylla, Pseudotsuga menziesii, and Thuja plicata.
 Most of this forest, whose trees were considered particularly tall for the Lower Mainland, was logged in the first few years of the 20th century.
While rainbow trout, sculpin, and crayfish were likely native to Deer Lake, most of the aquatic animals are introduced species.
These invasive species include bullfrog, ictalurid catfish and carp.

The Legend of Deer Lake, as told by E. Pauline Johnson, is a Coast Salish tale about a hidden waterway between False Creek and Deer Lake.
It was discovered by a young Indian, the first chief Capilano, who speared a "king" harbour seal in False Creek with his elk antler spear with western red cedar line.
 The seal escaped through a hidden underground creek, and he spent months looking for it by the shore.
 One day he was "beckoned" inland by what turned out to be the flames of a forest fire.
 On the shore of Deer Lake he found the remains of the seal and recovered his spear, and with it, his prowess as a hunter.

Today there is a condominium development overlooking the lake where Oakalla Prison, a maximum security prison farm, once existed.

Deer Lake School (K-12) located nearby is named for the lake.
Deer Lake and the surrounding park is a highly altered habitat. The vegetation natural to the area is temperate rainforest dominated by conifers such as Tsuga heterophylla, Pseudotsuga menziesii, and Thuja plicata.  Most of this forest, whose trees were considered particularly tall for the Lower Mainland, was logged in the first few years of the 20th century. While rainbow trout, sculpin, and crayfish were likely native to Deer Lake, most of the aquatic animals are introduced species. These invasive species include bullfrog, ictalurid catfish and carp.
The Legend of Deer Lake, as told by E. Pauline Johnson, is a Coast Salish tale about a hidden waterway between False Creek and Deer Lake. It was discovered by a young Indian, the first chief Capilano, who speared a "king" harbour seal in False Creek with his elk antler spear with western red cedar line.  The seal escaped through a hidden underground creek, and he spent months looking for it by the shore.  One day he was "beckoned" inland by what turned out to be the flames of a forest fire.  On the shore of Deer Lake he found the remains of the seal and recovered his spear, and with it, his prowess as a hunter.
Today there is a condominium development overlooking the lake where Oakalla Prison, a maximum security prison farm, once existed.
Deer Lake School (K-12) located nearby is named for the lake.
Deer Lake (British Columbia)