Snowpack is in general about average to a bit below average. First two weeks of June should be good timing, and front range, crested butte, and durango should all have good boating during that time. Your order should work well. I'm planning a similar type trip from Denver, and thats what I've lined up. We have recently had some dry and warm conditions that have hurt the snowpack a bit. Continued warm and dry could leave us with below average pack, so what happens in march/april will determine how good things are come June. Regardless there will be good water during that time though.
SNOTEL Basin Time Series Snowpack Summary Graphs | Colorado NRCS
This link shows snowpack % of average for each basin.