The Saint Lawrence Seaway forms a vital international corridor through this reach, where the boundary between Canada and the United States follows the deep water of the Saint-Lawrence River. The construction of the Iroquois Dam significantly altered this landscape, creating the expansive Lake Saint Lawrence above it. This engineering feat shaped the modern shoreline, defining prominent landmarks like Rockway Point and Sparrowhawk Point.
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1904 · Lisbon
USGS Topo · 1:48,000
1904 · Ogdensburg
USGS Topo · 1:62,500
1905 · Waddington
USGS Topo · 1:62,500
1905 · Ogdensburg
USGS Topo · 1:62,500
1906 · Red Mills
USGS Topo · 1:62,500
1910 · Canton
USGS Topo · 1:62,500
1911 · Canton
USGS Topo · 1:62,500
1942 · Waddington
USGS Topo · 1:24,000
1942 · Murphy Island
USGS Topo · 1:24,000
1943 · Ogdensburg East
USGS Topo · 1:31,680