The upper Manitoba Great Lakes (MBGL – Lakes Manitoba, Winnipegosis and Waterhen) act as filters that intercept nutrient flow from the Lake Winnipeg watershed, both as natural nutrient sinks and especially through operation of the Portage Diversion. Sample sites were established on all three lakes to measure physical parameters such as conductivity, temperature, depth, oxygen and light, as well as taking water samples to measure water chemistry and biological samples for algae and zooplankton. Li Gran Lak supirieurre dju Manitoba (MBGL – Lak Manitoba, Winnipegosis pi Waterhen) sa li kom di filte ksa l’anpêsh li nutriman d’kouli dju bassein idrografik varsan dju Lak Winnipeg, kom ein pwi d’nutriman nachurel pi, surtou, par li opirassion dju Kanal di Dirivassion d’Portage. Sa lâ itabli di sitte d’ishanchiyonaj su li twa lak pour misuri li paramêt fizik, kom la kondâkchiviti, la tanprachurre, la prâfondeurre, l’âxijêne pi la limyerre, pi même prande di ishanchiyon d’l’ô pour misuri la shimi d’l’ô pi misuri di ishanchiyon biâlojik pour l’alg pi dju zooplankton.