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New York State Route 421

New York State Route 421 marker

New York State Route 421
Map of the Tupper Lake area with NY 421 highlighted in red
Route information
Maintained by NYSDOT
Length: 5.70 mi (9.17 km)
Existed: c. 1931 – present
Major junctions
West end: Dead end at Horseshoe Lake in Piercefield
East end: NY 30 in Piercefield
Location
Counties: St. Lawrence
Highway system
NY 420 NY 422

New York State Route 421 marker

New York State Route 421 (NY 421) is a short state highway located within Adirondack Park in the southeastern corner of St. Lawrence County, New York, in the United States. It is a narrow, two-lane spur route connecting NY 30 to Horseshoe Lake by way of Tupper Lake. A dead end sign is posted immediately off NY 30, the only route with which it intersects. The entire road is located in the town of Piercefield, although that name is not posted on NY 421. The route offers access to several picnic and snowmobile areas.

The eastern portion of NY 421 was built in the 1920s under the terms of a 1923 law authorizing the construction of a highway leading from modern NY 30 north to Warren Point. This road was completed in 1925. NY 421 was assigned to the entirety of the north–south highway c. 1931. The roadway connecting Horseshoe Lake to Tupper Lake was built c. 1962 and became part of NY 421 by 1968. NY 421's former routing to Warren Point remained a state highway up through 1999, when a bill permitting the New York State Department of Transportation (NYSDOT) to remove it from the state highway system was signed into law.

NY 421 begins at a dead end south of the hamlet of Horseshoe in an isolated part of the town of Piercefield. Here, the highway connects to a pair of dirt roads, one of which leads north alongside Horseshoe Lake to Horseshoe. The two-lane route heads eastward from the trails, following the southern shore of Horseshoe Lake while traversing the deep woods of Adirondack Park. At the southeastern end of the lake, NY 421 turns northeastward, crossing a small stream feeding into the lake before curving back toward the east. For the next 2 miles (3.2 km), the road passes through unabated wilderness as it heads toward the western shoreline of Tupper Lake.


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