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Ochlodes sylvanoides
Near the waterfall. Very flighty.
This is one of the so called "folded-wing skippers"
Hesperiinae
This site may help.I used it when in Colorado.
http://butterfly.ucdavis.edu/butterfly/c...
A "skipper," which is a type of butterfly in the Hesperiidae family. Awkward angle from which to make a more concrete ID, but still might be do-able.