Thousand Islands Bridge Hill Island in Canada. Thousand Islands International Bridge system is a series of five bridges that span parts of the St. Lawrence River, ultimately connecting both banks. The southern end of the bridge connects with Interstate 81 and the northern end of the bridge connects to Highway 401 via Highway 137. There is also an interchange with the Thousand Islands Parkway on the Ontario side. The bridge suffered aerodynamic-related structural problems (oscillations) shortly after its opening, these were quickly corrected via structural upgrades. The bridge system is administered by the Thousand Islands Bridge Authority, a New York State public benefit
Thousand Islands Border Crossing Thousand Islands Border Crossing The Thousand Islands Border Crossing connects the towns of Alexandria Bay, New York and Ivy Lea, Ontario on the Canada–US border. The crossing is via the international span of the Thousand Islands Bridge. The Thousand Islands bridge, which was completed in 1938, is actually a system of three bridges and the island roadways connecting them. The international span, which crosses a small rift between Wellesley Island in the US and Hill Island in Canada, is only in length. A second, parallel span was built in 1959 to accommodate congestion at the ports of entry. The US