This study was conducted in support of plans to develop bitumen reserves in northeastern Alberta using steam assisted gravity drainage (SAGD) technology. The bitumen reservoirs also contain natural gas reserves. Gas production in the area threatens the viability of SAGD bitumen production. A regional hydrodynamic study of the Athabasca/Clearwater Area was undertaken to provide a foundation for evaluation of oilsands leases in the area and aid in determining the extent of pressure depletion. The study illustrates the existence of a hydrodynamic system that is consistent from surface to the Devonian, including the Wabiskaw/McMurray. Consequently, pressure communication between gas pools in different regions of influence through a common aquifer is very likely. In addition to the regional scale analysis, local-scale work was done in individual lease areas. This study provides an understanding of the natural regional groundwater flow pattern, the extent of pressure drawdown in gas pools, and allows prioritization of areas in need of protection. It also provides excellent reference information by characterizing formation waters for water source/disposal site selection.