New York State Route 86A

New York State Route 73
Map of Essex County in northeastern New York with NY 73 highlighted in red
Route information
Maintained by NYSDOT
Length	27.55 mi (44.34 km)
Existed	1930 – present
Major junctions
East end	US 9 in Elizabethtown
	NY 9N in Keene
West end	NY 86 in Lake Placid
Location
Counties	Essex
Highway system
New York Highways Interstate U.S. State Reference Parkways ← NY 72 NY 74 → ← NY 86 NY 86A I-87 →

New York State Route 73 (NY 73) is a state highway located entirely within Essex County, New York, in the United States. The highway begins at an intersection with NY 86 in the village of Lake Placid and ends at a junction with U.S. Route 9 (US 9) north of the hamlet of Underwood in the extreme southwestern corner of the town of Elizabethtown. NY 73 meanders through a mountainous region of Adirondack Park and passes by several named peaks, including Porter Mountain and Lower Wolfjaw Mountain. Along the way, the route has a short concurrency with NY 9N in the town of Keene.

In the early 19th century, Lake Placid and Keene were connected by the North West Bay Road, an east–west highway linking Hopkinton to Westport. The highway was initially a crude, impassable road; however, it was significantly improved by the state of New York in the mid-1810s. A highway linking Keene to Underwood was constructed by 1846; at Underwood, the road connected to a stagecoach road that went from Albany to the Canada–US border. The latter road became the basis for most of modern US 9.