Trout River is a border crossing connecting Elgin, Quebec to Constable, New York on the Canada–US border, most prominently featuring the Trout River Border Inspection Station. The crossing can be reached by New York State Route 30 on the American side and by Quebec Route 138 on the Canadian side.

New York State Route 30 (NY 30) is a state highway in the central part of New York in the United States. It extends for 300.71 miles (483.95 km) from an interchange with NY 17 in the Southern Tier to the US–Canada border in the state's North Country, where it continues into Quebec as Route 138. On a regional level, the route serves to connect the Catskill Park to the Adirondack Park. In the latter, NY 30 is known as the Adirondack Trail. Aside from the state parks, the route serves the city of Amsterdam and several villages.