Just to let anyone interested in this run know:
Ran it today @ 450 cfs, put in just below the Seven Castles bridge. Slide rapid came up in just over a 1/4 mile. I found it to be a III+ rapid with a nice surf wave at top and a slide at the bottom, immediately followed by solid III water and a strainer.
Shortly there-after is the mandatory portage where it looks like the river has recently flooded and changed it's natural channel.
Not too long after the portage we came across a place where the river splits around another island, the left side had minimal water so we went right, and the was a river-wide downed cottonwood requiring another portage or a super tight limbo move.
Then you have slack water for a mile or so, followed by the only solid IV (in my opinion) on this stretch. You have a complicated lead in to an island with multiple stacked holes in the only boatable channel (far left), then this channel split in two and they both had 1/2 to 3/4 river wide strainers at the bottom. I found it to be fun, my friend who was swimming did not...
Below that was 3-4 more solid class III drops before we arrived in the town of Basalt, taking out just above the confluence with the Roaring Fork.
A great stretch for class III boaters ready to push their limits, or for an off-season destination, I definitely plan on boating it again.