In 1908, the
New York State Legislature created Route 32, an unsigned
legislative route extending from North Lawrence to
Ogdensburg via Winthrop and
Massena. It entered Massena on what is now
NY 420 and followed Main Street and Maple Street through the village. West of Massena, the highway was routed on Town Line Road and River Road to a junction east of
Waddington, where Route 32 continued west on modern
NY 37 to Waddington. When state highways in
New York were first posted in 1924, the portion of Route 32 between Waddington and Massena became part of
NY 3, a highway extending across the width of the state. topographic map depicting NY 37B's original alignment The segment of NY 3 east of
Watertown was rerouted as part of the
1930 renumbering of state highways in New York to largely follow its modern alignment between Watertown and
Plattsburgh. Most of NY 3's former alignment along the
St. Lawrence River from
Alexandria Bay to
Hogansburg became part of the new
NY 37; however, from Waddington to Massena, NY 37 used a more inland routing. As a result, the former routing of NY 3 between the two villages became NY 37B instead. In the mid-to-late 1950s, NY 37 was rerouted to follow a new bypass around the southern edge of Massena. In the 1950s, construction began on the
St. Lawrence Seaway, a system of canals and locks that would make the St. Lawrence River suitable for shipping. As part of the seaway's construction, a low-lying area in
Ontario and New York between Waddington, New York, and
Cornwall, Ontario, would be inundated with water in order to create a navigable channel through the
Long Sault rapids and to allow hydroelectric stations to be established immediately upriver from Massena and Cornwall. On July 1, 1958, the intentional flooding was carried out via the destruction of a
cofferdam upstream, creating what is now known as
Lake St. Lawrence and inundating the majority of NY 37B west of Massena. Following the destruction of the majority of NY 37B, the route was realigned west of Massena to follow a new riverside roadway to the
hamlet of Louisville Corner, where it came to an end at NY 37. The remainder of NY 37B along the Massena–
Louisville town line road and in Massena was unchanged. ==Major intersections==