New York State Route 631

New York State Route 631
Map of northwestern Onondaga County with NY 631 highlighted in red
Route information
Maintained by NYSDOT, Onondaga County and the town of Lysander
Length	5.05 mi[1] (8.13 km)
Existed	June 1999[2]–present
Major junctions
South end	NY 370 in Baldwinsville
North end	NY 48 / NY 690 in Lysander
Location
Country	United States
State	New York
Counties	Onondaga
Highway system
New York Highways Interstate US State Reference Parkways
← NY 598 → NY 635

New York State Route 631 (NY 631) is a north–south state highway in Onondaga County, New York, in the United States. It serves as a bypass around the village of Baldwinsville, extending for just over 5 miles (8.0 km) from an intersection with NY 370 in the southeastern part of the village to a junction with NY 48 and NY 690 just north of Baldwinsville in the town of Lysander. The route has a short overlap with NY 31 east of the village. Most of the route is two lanes wide and passes through rural areas around the edge of Baldwinsville, while a part near the Lysander community of Radisson is four lanes wide and serves residential and commercial neighborhoods.

A bypass of Baldwinsville had been proposed as early as the 1970s. The earliest concepts for the road called for a long highway connecting NY 690 south of the village to NY 481 in Clay, east of Lysander. After two decades of planning and community input, the New York State Department of Transportation (NYSDOT) presented four potential alignments for a scaled-back route running from NY 48 to NY 31 in 1994. Although an alignment encircling the village limits was chosen within four years, work on the project was stalled due to a lack of funding. In the meantime, NY 631 was assigned in 1999 to a series of pre-existing local roads that formed a northern bypass of Baldwinsville between NY 48 and NY 31. The section of the originally planned southern bypass northeast of NY 370 was finally completed in 2001 as an extension of NY 631.