Yes, that is how I picture Colorado in front of my inner eye! The sky is a bit weird in 1 and totally blown in 4, which is a pity, you went for a long exposure in 4 to capture the motion of the water, but that did not work well with the sky, and in 1 the clouds look --- funny. But the shadows in the foreground are very ... erm, well, yes ... shadowy. Maybe you can tone-map that one still more?
Too much sky in the third ... so the second cannot but turn out to be my favourite here.