Landslides threaten people and property in many parts of Canada, from the St. Lawrence Valley to the mountains of the Cordillera, causing $100-200 million in damage in Canada every year. Population growth is pushing development into formerly remote areas that are prone to landslides. Even small landslides are a significant threat to lives as well as transportation infrastructure as they disrupt the movement of goods, and are costly to clear. Construction of more roads and rail links increases the likelihood of transportation infrastructure being disrupted by landslides. Furthermore underwater landslides off the coast of British Columbia have destroyed wharves and warehouses and in 1914, a landslide at Hell's Gate, BC, prevented salmon from returning to their spawning grounds. Economic losses, in terms of reduced salmon runs, are estimated to be in the hundreds of millions of dollars and are still being felt, almost ninety years later.