I found a Baird's Sandpiper mid-day at Triadelphia Reservoir on the mudflats north of the Greenbridge/pipeline trail on the Montgomery County side.  It was with several Killdeer and Least Sandpipers, providing useful comparisons of size and structure.  I ran back to the car to get a camera, but I wasn't able to get any good photos in the rainy conditions before all the birds took off and flew into Howard County.   I couldn't follow them far enough to tell if they landed across the reservoir or kept on flying.

When I arrived there was Caspian Tern flying around the reservoir.  I also found a migrant flock that contained a Nashville Warbler.

John Hubbell
Washington DC