By the early twentieth century the estate was being managed for sporting interests (deer stalking, fishing and grouse shooting), alongside sheep farming and forestry. The construction of the Laggan Dam (completed 1934) as part of the Lochaber hydroelectric scheme led to a reduction in the amount of grazing land in the area, causing an increase in deer numbers at Creag Meagaidh. By the 1970s sheep farming had largely ceased, and deer stalking had become the main activity on the estate. In 1983 the estate was sold to Fountain Forestry, who proposed to plant much of the area with Sitka spruce plantations. There was public opposition to this plan, and in 1985 the estate was sold to the Nature Conservancy Council (predecessor to NatureScot), who declared the area a national nature reserve in 1986.