Washington County, New York is part of the Great Appalachian Valley (also known simply as the 'Great Valley') which is a long narrow valley strip often between tall mountain ranges. The county transitions from the Taconic Mountains to the Adirondack Mountains, and from the Lake Champlain Valley to Hudson River Valley. Much of the county is part of the slate valley of the Upper Taconic Mountains (Taghkanic, meaning 'in the trees'). The eastern boundary of Washington County is the New York–Vermont border, part of which is Lake Champlain. This is also the border with New England proper. The northern end of the county is
New York State Route 185 28, 2009, as a result of those concerns, temporarily reducing NY 185 in purpose to a spur route linking NY 9N and NY 22 to Crown Point. Its replacement, the Lake Champlain Bridge, opened to traffic on November 7, 2011. New York State Route 185 New York State Route 185 (NY 185) is an east–west state highway in Essex County, New York, in the United States. It serves as a connector between NY 9N and NY 22 in Crown Point and the Lake Champlain Bridge, by which the highway enters Vermont and becomes Vermont Route 17 (VT 17). NY 185,