Trout River is a border crossing connecting Athelstan, 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. There are several buildings near this crossing that were built prior to the establishment of the US-Canada border in 1842. These include a former duty-free shop and two residences.