Oneida Lake, the largest body of water located entirely within the boundaries of New York State, is marked by three identical lighthouses. At the extreme western end of Oneida Lake stands the Brewerton Rear Range Lighthouse, marking the entrance to the Oneida River. The fore light of the Brewerton range is located on the NYS Rte 11 Bridge and the fixture still in place today. When navigating, the mariner would align the fore light, with the rear light vertically to position in the center of the "channel" avoiding shoals. Although all three towers are still active today, the Brewerton Rear Range Light is no longer visible from the lake, having been blocked by the bridges for US-11 and Interstate 81. In 1949, the light on Frenchman's Island received a 20-foot addition, however, even with this addition, today, the light is barely visible over the tree tops.