Stumped by shorebird

This past weekend I captured this image of some type of shorebird. The wife and I were riding on the Bellevue-Oxford Ferry (Chesapeake Bay area). I only got one "good" shot of him. I did not get to see him in flight.

I've been through Peterson's ... rail, ibis, bittern, ... I am stumped as to what this fellow might be.

Can anyone ID this bird?

Attached Image:

There is zero doubt that it is a Green Heron

Ken