Whats the difference? Perhaps a better approach would be to ask, how many miles of rivers in Colorado can you NOT take a raft down?
Practically anything that can be run in a kayak can be run in a raft...Gore, Wildcat Canyon, Source. This question needs more sidebars to answer fairly.
Unless you are looking to differentiate commercial raft miles from non-commercial raft miles. Perhaps, guessing from your buzz join date, this inquiry has something to do with HB 1188?
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