I thought the Dolores flow in this section was controlled by releases from the McPhee Dam which means that they could jack it up to boatable flows at any time. They have a release plan online, but its kind of hard to make sense of:
Dolores Water Conservancy District
You could call them and find out what the plan is for this weekend in terms of releases from the dam. They claim to try and provide boatable flows on certain spring weekends. I was considering this trip for 2 weekends from now, and that was my plan.
Also, if you ever need someone to go boating with, let me know! My girlfriend and I have a 12.5 foot raft and are always looking for overnighters to go on.