If you visit the Table Rock area near the Canadian Horseshoe Falls you’ll see a giant crane near the edge of the falls. The crane is used to lower two workers in a gage below the falls to remove any loose rocks and debris that had built up over the winter. This is an annual event and done to prevent rocks from falling to the lower observation deck of the Journey Behind the Falls attraction.
“Ice-jacking” is the name of the process that loosens the rocks on the gorge face. Water captured in the crevasses of the rocks freezes and thaws over long periods of time and creates loose rocks. Rocks are chiseled out and allowed to fall into the gorge creating a sloped fortification wall called talus. This talus is either removed, or left in place upon completion.
During this operation the Journey Behind the Falls attraction remains open daily except the lower outdoor observation deck.