Lucien M. Turner, Ethnology of the Ungava District…
“ At the last bend, however, a large island, locally known as Big island, not only obstructs but ends navigation for boats drawing over 6 feet. Small boats, such as skiffs and native boats, ascend to the lower end of 7-mile run. The principal obstruction to travel in any kind of vessel in the Koksoak from Big island to the mouth of the Larch river is the presence of two falls or rapids about 40 miles from Fort Chimo. ”
