Wapta Falls is near the west end gate of Yoho National Park on the Kicking Horse River. From the TransCanada Highway it is an easy half hour hike one way going 7-kilometres round-trip. The Kicking Horse River drops 27 metres at its full height and is 61 metres across. Wapta Falls has the largest volume of water of all waterfalls in Yoho National Park; with the distinction in 1858 of being close to the spot where Kicking Horse Pass explorer James Hector was kicked in the chest while trying to recover a runaway horse. He recovered enough to push on with the expedition which proceeded to make the first recorded passage of what is now known as the Big Hill leading up into the Bow Valley from the present day location of Field. Expedition members aptly named the river The Kicking Horse.
Source: http://www.field.ca/yohonationalpark/waterfalls/ Tales From The Canadian Rockies, Brian Patton (1994)