No one knows how long the Roberts Tunnel will remain on. Denver Water will continue to release water as long as there is downstream demand. This can change quickly based on wet weather trends or hot and dry conditions. Currently Denver Water is holding back water on the South Fork of the South Platte to try and keep Cheesman Reservoir full. Currently the water is 100 cfs below Cheesman Reservoir.
According to Chris Wells, Fishing Manager at The Meadows, "The North Fork of the South Platte is fishing excellent right now. The fresh water from the Roberts Tunnel has rejuvenated our fishery." As long as the flows remain above 100 cfs, and Denver Water supplements flows with Roberts Tunnel water, the river will continue to fish well. Keep your fingers crossed that Denver Water will continue to release water throughout the fall and winter months!