add So.Platte below Cheeseman [ wateralk station# 40] to NO. Fk. at Bailey#68 then subtract sum from Waterton#50,the difference will be divided between the two forks, probably more coming down the SP now because of lower elevation.More during peak run off down the NF because Deer and Elk creeks drain Mt. Evans.Add 1/2 +/- to respective fork.Late season is closer to dam flows as tribs contribute minimal water. This method of reckoning is semi-accurate.