Watertown to Ogdensburg NY 37 begins at an intersection with
US 11 just north of
Watertown in the town of Pamelia. Between Watertown and
Theresa, NY 37 follows a north–south alignment and parallels
Interstate 81 (I-81), located just west of NY 37. Southwest of Theresa, I-81 turns to the northwest as NY 37 intersects
NY 26 and
NY 411, the westward continuation of NY 26. NY 26 joins NY 37 around the western edge of the village before splitting to the northwest a short distance to the north. NY 37, however, continues northward, passing through
Redwood before curving northeast as it enters
St. Lawrence County. Across the county line, NY 37 parallels
NY 12 to the north as both routes proceed northeast. Roughly from the county line, NY 37 encounters
Hammond, a small village located west of
Black Lake. Past Hammond, Route 37 heads north toward
Morristown, where it meets NY 12, the primary roadway along the
St. Lawrence River's southern bank west of this point. NY 12 ends here; however, NY 37 takes over the routing of NY 12 and proceeds northeast along the edge of the St. Lawrence River. Just east of NY 12, NY 37 meets the northernmost point of
NY 58. In the
Louisville hamlet of Louisville Corner (west of
Massena), NY 37 departs the St. Lawrence River and intersects the western end of
NY 131, a northerly bypass of Massena along the riverbank. Farther east in Massena, NY 37 intersects
NY 37B, the former routing of NY 37 through Massena, west of the village before crossing over the
Grasse River and intersecting the northern termini of both
NY 56 (where NY 37 widens into a four-lane
divided highway) and
NY 420. NY 37B later rejoins NY 37 east of the village, as does NY 131 directly north of the
Massena International Airport. Although most of NY 37 in the town of
Bombay is contained within the reservation, a short portion east of
Hogansburg and the
St. Regis River and west of Tarbell Road is located outside the reservation limits. Within this stretch, NY 37 meets both the eastern end of NY 37C and the northern terminus of
NY 95. East of the reservation, NY 37 roughly parallels the
CSX Transportation-owned
Montreal Subdivision northeast to
Fort Covington, where NY 37 crosses the railroad line and intersects Water Street (unsigned NY 970T), a connector to
Quebec Route 132 on the northern side of the
Canadian border. East of Fort Covington, NY 37 follows a more southeasterly routing as it separates from the northernmost extents of the state. In the
Westville hamlet of Westville Center, NY 37 meets the western terminus of
NY 122. Farther south, NY 37 enters the village of
Malone, where it terminates at
US 11,
NY 11B and
NY 30. ==History==