The valley of Highland Creek was at one point a settlement. After World War II, a shortage in housing resulted in many new residences being built from cottages. However, an increase in settlers was becoming problematic as contaminated wells, evictions, and home demolition were contentious issues in the post-war period. Living conditions were further complicated by the steep slopes and flat floodplain of the Highland Creek further in the area as residents and their cottages were regularly threatened by flash flooding. In 1954, severe damage from Hurricane Hazel led to the removal of housing in the area. Public ownership of floodplain land was established to prevent further development. The area eventually turned into parklands and wildlife was restored.
Over 5,000 White Pine trees were planted in Morningside Park by the Boy Scouts of Canada in 1994.