Early explorers passing through the Lake Winnipeg watershed occasionally commented on the muddy waters of the lake and the Red River (Ross 1856, p. 9; Palliser's Journals of 1857- 1860 in Spry 1968, p. 11,88,.94; Upham ...

Lake Winnipeg water is usually turbid, and little light penetrates into the lake. Secchi disc visibility varied from 0.1 t 1.0 m in the south basin and 0.5 to 2.6 m in the north basin. Horizontal extinction coefficients ...