Clearwater County is a municipal district in west central Alberta, Canada in Division No. 9.Its northwest boundary is the Brazeau River. The municipal office is located in the Town of Rocky Mountain House.n the 2011 Census, Clearwater County had a population of 12,278 living in 4,698 of its 5,358 total dwellings, a 3.8% change from its 2006 population of 11,826. With a land area of 18,691.78 km 2 (7,216.94 sq mi), it had a population density of 0.7/km 2 (1.7/sq mi) in 2011. According to the Canada 2006 Census :