The origin of the name of the lake and the "Des Quinze River" is explained in another survey report dated May 1873 by Walter McOuat, who writes that he "went up the Ottawa to "Lac des Quinze", a distance of about 15 miles ,... This part of the Outaouais is designated in the locality under the name "Les Quinze", which comes from the fact that, to go up in a canoe, it is necessary to make about fifteen portages "(corresponding to as many cascades or falls).