New York State Route 104A

New York State Route 104A
Map of central New York with NY 104A highlighted in red
Route information
Auxiliary route of NY 104
Maintained by NYSDOT
Length	17.38 mi[1] (27.97 km)
Existed	April 1935[2]–present
Tourist routes	Great Lakes Seaway Trail
Major junctions
South end	NY 104 / NY 370 near Red Creek
North end	NY 104 in Oswego
Location
Country	United States
State	New York
Counties	Wayne, Cayuga, Oswego
Highway system
New York Highways Interstate US State Reference Parkways
← NY 104 → NY 104B

New York State Route 104A (NY 104A) is a northeast–southwest (signed as north–south) state highway in the central portion of New York in the United States. It serves as a northerly alternate route of NY 104, to which it connects at each end. The route extends for 17.38 miles (27.97 km) from an intersection with NY 104 and NY 370 south of the village of Red Creek in Wayne County to a junction with NY 104 southwest of the city of Oswego. NY 104A spans three counties, serves two villages (Red Creek and Fair Haven) and parallels Lake Ontario for much of its length. All of NY 104A is part of the Seaway Trail, a National Scenic Byway.

All of NY 104A was originally part of Route 30, an unsigned legislative route, during the early 20th century. In 1924, modern NY 104A became part of NY 3, then a cross-state highway that continued west to Niagara County. U.S. Route 104 (US 104) replaced most of NY 3 between Rochester and Maple View in April 1935. From Red Creek to Oswego, however, US 104 used a more southeasterly alignment via Hannibal. The Red Creek–Oswego segment of NY 3 became NY 104A instead.