The Kicking Horse River is in the Canadian Rockies of southeastern British Columbia, Canada. The river was named in 1858, when James Hector, a member of the Palliser Expedition, reported being kicked by his packhorse while exploring the river. Hector named the river and the associated pass as a result of the incident. The Kicking Horse Pass, which connects through the Rockies to the valley of the Bow River, was the route through the mountains subsequently taken by the Canadian Pacific Railway when it was constructed during the 1880s. The railway's Big Hill and associated Spiral Tunnels are in the Kicking Horse valley and were necessitated by the steep rate of descent of the river and its valley.