Correct! It used to be called the Louisiana Heron - offcials want to get away from place names. The tell-tale is that is has yellow legs, as the reddish egret in dark morph has dark legs. See the Sibley Guide, pages 62 and 62.
Beautiful shot, worthy of a professional photographer. I would like to know what make and model of camera you used and the settings.
I'm really not much of a photographer but if I take enough shots sometimes I get lucky.. I took at least 24 shots of the heron as he worked the shore 50 feet or so up in front of me..
Canon Powershot S3/si set to Auto and at full zoom (12x).