250- 350 is probably the easiest level/ below that and it gets pinney. above 4-450 get pretty pushy. It is easy to walk most things, but the "slackwater" is anything but. Most people end up running lots of stuff unscouted, that they mihgt have spent 10 minutes scouting were it elsewhere. There are 3 drops that are usually portaged now. The Gash, which is a the second major drop. The 40 footer is portaged even by Forrest, although he stares at it for a long time before throwing in the towel. The entrance to RIMBY is deceptively undercut and has been the site of many a scary story. The "heart" of RIMBY is a sweet 10+ foot boof. THe runnout tends to collect wood. The S turn and the lumberyard desevrve scouts, but are frequently read and run (pray for apprropriately placed wood).
Carnage is second nature on this run. Expect trouble and be ready to deal.
As most know, Gash was the site of Paul Zirkelbach's demise in '02. There are lots of very skilled creek boaters who have written this one off. If you ever saw it at low water, you would never run it again.
If you go, be safe, bring an experienced guide if you can. This run can be a lot of fun.