[cobirds] Help - can't be a Snowy Egret

OK, I haven't posted much and live on the Western Slope. I am in Denver for the weekend and saw this bird on the cormorant rookery island at City Park. I had seen four or five Snowy Egrets in the park, so assumed this bird was the same. But I don't think so. This is the only individual that did not have black legs. The only other candidate I can think of is Little Blue Heron (immature). Someone help please.

Byron Hukee

So here is the photo: