YOHO NATIONAL PARK AND VICINITY - Canadian Rockies: Including Banff and Jasper National Parks - page 285

MM Emerald Lake
Outfitter Tom Wilson stumbled on stunning Emerald Lake while guiding Major A. B. Ro-
gers through the Kicking Horse River Valley in 1881. He was led to the lake by his horse,
which had been purchased from natives. He later surmised that the horse had been ac-
customed to traveling up to the lake, meaning that the horse's former owners must have
known about the lake before the white man arrived.