Route 146A is the last existing spur of NY 146 in Saratoga and Schenectady counties.

A two-lane highway, NY 146A heads northward as Vischer Ferry Road from a four-way intersection with NY 146 at Vischer Ferry Road (County Route 90 or CR 90), which continues southward from that intersection to Crescent Road (CR 92) in Vischer Ferry.

After passing over a railway, NY 146A turns westward and becomes Ballson Lake Road, passing by the Van Patten Golf Course and a link to Ushers.

[3] In 1908, the New York State Legislature created Route 25, an unsigned legislative route extending from Whitesboro to Albany by way of the southern portion of Adirondack Park.

[4][5] The segment of legislative Route 25 from Ballston Lake to Clifton Park was designated as NY 146A in early 1931.