The original 47 hectare park was designated in 1956. An additional 118 hectares of upland and 48 hectares of foreshore was designated in 1996 as a result of recommendations made in the Kamloops Land and Resources Management Plan. It was intended that the addition be kept natural, with no development or vehicle access. The park will be managed according to the Management Direction Statement for Lac Le Jeune Park.
The park protects upland and riparian habitats on portions of Lac Le Jeune. The trout fishery is provincially significant. A marsh on the east side of the lake is protected. A sunscreening canopy of lodgepole pine plays shadows on the pine grass of this lakeside park. The waters of Lac Le Jeune are famous for fighting rainbow trout.
The park provides habitat for moose, mule deer, beaver, osprey, song birds and waterfowl.