I was in Crested Butte 2 weekends ago, and the passes were very difficult - one couple said they thought they were going to get swept away fording W Maroon Cr. At Diamond L in the Indian peaks last weekend the drifts were 3-4 ft deep. So it is still very much early summer conditions in CO.
A good bet is Lost Cr Wilderness, which I believe Dondo has described in his excellent blog. Another, more remote candidate for your consideration would be the Troublesome wilderness, especially if you are interested in fishing. Some easy 3-day loop trips at lower altitudes are possible on the east side.