Black Canyon of the Bear, S.E. Idaho, in a packraft?

Has anyone ever done it? Im trying to get on it this weekend for the last sceheduled release if I can find someone to carpool with from the Wasatch Front this Saturday or Sunday. Its about 10-15 miles long I think. About 80% class I and II, 10% class III, and 9% class IV, and 1% V-. All of the rapids are portageable. There are 4 weekend releases per spring of about 1000 cfs from the end of of April to the beginning of June. It is considered a classic whitewater run for those in surrounding states.