on March1, 1956, and began in June. McNamara Construction graded the future causeways while Davey Construction built the bridges. As a result of this dry construction, the three bridges carrying the parkway stood crossing empty fields as Ontario Hydro began to clear the of land that would be flooded in Ontario in 1957. On June26, 1957, the Department of Mines released names for the future islands along the parkway, with each chosen to commemorate early settlers or communities lost to the project. Inundation Day, when the flooding would begin, was set for July1, 1958. At 8am EDT, 30tons of dynamite was detonated, knocking holes in the cofferdam holding back the St. Lawrence River at Long Sault. Water slowly but visibly crept up through the now-cleared farmlands and forests of the area for the next three days, ending July4. However, the Long Sault Parkway and the amenities along it were not complete by that time. The road itself opened in November 1958, while various beaches and campgrounds opened by the following summer. Major intersections See also The Lost Villages References External links Drone video of entire parkway Geography of the United Counties of Stormont, Dundas and Glengarry Parkways in Ontario St. Lawrence Parks Commission