At 1pm there was a Horned Grebe on the Potomac between the Memorial  
Bridge and the 14th Street Bridge.  He looks to be right in the midst  
of transitioning into breeding plumage.

I tried for the Red-throated Mergansers seen earlier by Tom Jones just  
down river a bit but I think they are long gone.  Lots of boat traffic  
speeding around probably cleared them out.

Cheers,
Steve Hersey
Washington, DC