Stopped by Conowingo Dam yesterday.  Not many gulls.  I had one adult Thayer's-type Gull below the dam on the rocks and had what was likely the same bird flying above the dam as seen from the Glen Gove boat launch.  Hundreds of Common Mergansers above the dam.  

A quick stop a Turkey Point produced thousands of Goldeneyes and hundreds of Lesser Scaup but nothing usual in with them.

Brendan Klick
Baltimore, MD