Steve Hersey emailed me twice around 4 pm to say that he had the Tricolored Heron for about five or ten minutes at Violette's Lock.  A Green Heron chased it off.  

"Sitting here at violettes lock and the tricolored heron just popped in  
on a log 40 feet away.  Dave chappelle (sp?) just left and guaranteed  
me the heron would show up if he left - thanks Dave!"

and 

"Green heron just swooped in and chase off the tri-colored.  Needless to say, was having too much fun watching and didn't get any photos...bummer."

Rob Hilton
Silver Spring