Water flows into Lake Owasso from Central Park. Water outflows from Lake Owasso to Lake Wabasso, then to Grass Lake, then to West Vadnais Lake, then to Lake Gervais, then to Keller Lake, then to Lake Phalen, and finally to the Mississippi. In addition to accepting water outflow from Wabasso, Grass Lake has the added challenge of also accepting water from the Snail Lake area. See directional red arrows on map below. Also note that East Vadnais Lake (drinking water) has an independent inflow and outflow from West Vadnais Lake.