Today I enjoyed the Cherry Creek walleye spawn as a 1st time volunteer. I'm guessing we pulled about 200 eyes from the gill nets. Several were 10-15 pounds. I asked one biologist why walleye, for the most part, are unsuccessful with natural reproduction in Colorado. I said, "is it the fluctuating water levels or the lack of big river systems". He said, "water quality". He went on to explain how Chatfield, Cherry Creek, and Pueblo have too much silt/sediment, which prevents a pure water pathway & clear bottom for the eggs and milt to meet (in a 90 second window of fertility after spewing out). Then, he surprised me by stating Carter & Horsetooth have sufficient water quality for natural reproduction without stocking efforts, and even stated they don't get stocked there. I should have asked about Aurora. Does anyone know if Aurora walleye are a self sustaining population?