However, this area was closed to tourists after 1969, due to cracks being found in the rock foundation. In 1983 the United States Army Corps of Engineers blasted away 25,000 tons of unstable rock, added more landfill, and built diversion dams and retaining walls to force the water away from Terrapin Point. Altogether  of the Horseshoe Falls was eliminated, including  on the Canadian side.
However, this region was shut off to visitors after 1969, due to cracks being discovered in the rock base. In 1983 the United States Army Corps of Engineers blasted away 25,000 tons of unstable stone, added more fill material, and constructed diversion dams and retaining walls to divert water away from Terrapin Point. As a whole, part of Horseshoe Falls was eliminated, including on the Canadian side.