The Kiffer Forest Preserve, in the northernmost part of the Abbimac Valley, is where most of the bears in the valley reside  During the eight years that the main road through the preserve has been closed the preserve' s bear population has nearly doubled
Thus, the valley' s bear population will increase if the road is kept closed
Only some of the increase in the preserve's bear population over the past eight years is due to migration of bears from other parts of the Abbimac Valley.