It heads northeast as a two-lane, rural highway, surrounded on both sides by dense woods.

At this point, NY 104B begins to follow a routing parallel to the Lake Ontario shoreline 1 mile (1.6 km) to the north.

[3] Past CR 1, the route serves less isolated areas as it crosses small patches of open farmland on its way to the town of Mexico.

After 1 mile (1.6 km), NY 104B enters the small hamlet of Texas, located on the western bank of the Little Salmon River.

[3] The entirety of NY 104B is part of the Seaway Trail, a National Scenic Byway that extends across most of Upstate New York from the Pennsylvania state line to Massena.

[7][8] U.S. Route 104 (US 104) was assigned in April 1935 to an alignment extending from Niagara Falls to Maple View.