A large volcanic eruption from any volcanoes in the Mount Cayley field would have major effects on the Sea-to-Sky Highway and municipalities such as Squamish, Whistler, Pemberton and probably Vancouver. Because of these concerns, the Geological Survey of Canada is planning to create hazard maps and emergency plans for Mount Cayley, as well as for the Mount Meager massif north of the volcanic field, which experienced a major volcanic eruption 2,350 years ago similar to the 1980 eruption of Mount St. Helens.