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Photo#484274
Mead's Sulphur, Colias meadii check id please - Colias meadii

Mead's Sulphur, Colias meadii check id please - Colias meadii
Arapaho National Forest; Rocky Mountains, Colorado, USA; , Mount Evans, alpine tundra, 12,000 ft elev County, Colorado, USA
August 1, 2010
Mead's Sulphur, Colias meadii, sunning, raise temperature, thermoregulation, laying flat on ground

It certainly looks correct to me,
especially with that extra "hairy" body, and the habitat makes others that look like it less likely. If you saw it fly, it should have been distinctly orange above (unless it is a white female, but I tend to think it's male). If you have another photo that shows more of the front wing, that should have orange on it too. There is a very small chance it's something else, but I seriously doubt it.

Moved from ID Request.

 
Thanks David
It was cold up there we had our jackets on. Another individual flying was orange above.