and paving of Highway 43 (originally sections of Highways 2, 34, and 43 from the BC border to the Yellowhead Highway just west of Edmonton) in 1956 cut down on the travel time by road significantly, further enhancing Grande Prairie's accessibility and economic status. The town of Grande Prairie was incorporated as a city in 1958. At that time, its population was approximately 7,600. The opening of the Procter & Gamble kraft pulp mill in 1972 and the discovery of the Elmworth deep basin gas field spurred an economic boom. Grande Prairie's population went from just over 12,000 in the early 1970s to over 24,000 by the time the oil boom went bust in 1981. In the five years from 2001 to 2006, Grande Prairie was one of the fastest-growing cities in Canada, growing from 37,000 to 47,000 people. After 2006, and with another recession, the population decreased slightly, followed by a slow increase to just over 69,000 by 2018. Geography Grande Prairie is located just north of the 55th parallel north, and is northwest of Edmonton, lying at an elevation of above sea level. The city is surrounded by farmland to the north, east, and west. To the south lies a vast boreal forest with aspen, tamarack, lodgepole pine, jack pine, and black spruce extending well into the foothills of the Canadian Rockies south and southwest of the city. Bear Creek goes through the city from the northwest to the south end and is a tributary of the Wapiti River to the south. The Bear Creek Reservoir is the small body of water by Grande Prairie Regional College in the northwest part of the city, and is ringed by marshy wetland. The terrain immediately surrounding Grande Prairie is largely flat to gently rolling, but rises gradually to hilly terrain closer to the foothills to the south and southwest. On clear days, some peaks in the Rockies are visible to the southwest from Grande Prairie. The city lies on the southern edge of aspen parkland, which is a transitional biome between boreal forest and prairie. The Peace River Country contains the northernmost area of aspen parkland in North America. However, much of the aspen parkland in the region has long since been destroyed by extensive farming and oil/gas drilling activity. Climate Grande Prairie has a northern continental climate typical of northwestern Alberta and northeastern British Columbia, classified as humid continental