My first impression is that the horizon is centered awkwardly or at least a strong line of the dam, - but the color wins you over- the slight purples in the fore, the cobalt above- the candy corn floating rocks in the purple shimmer with gold, the buildings add intrigue and as does the setting sun. This is one of my favorites.
Obvious use of a tripod, or any other long-term stabilization tool (1-10 *is not the score of the shot though*): 10
Smooth water and sharp objects shows tripod usage.