The poudre gets a wild a scenic designation becuase there are no main stem dams on the poudre. That was one of the major selection criteria rivers in CO were last considered. Is the poudre drainage impacted by dams and transmountain diversions? you betcha. Thats what allows us to boat into late august on most years. if the hydrograph was completely natural we would be hanging up the boating gear in mid july.
in the early season the flow is mainly natural and comes from the south fork and big south section in RMNP. in the later season (after july) reservoirs play a big part with regard to how much water is in the river.
the recently released NISP EIS actually has some intersting factoids on the poudre basin,
average annual natural flow 278,600 acre-ft
average annual transbasin imports 38,764 acre-ft
CBT average annual import 93,200 acre-ft
The high side of good - Daniel D