While unsuccessfully attempting to find a White-rumped Sandpiper at Merkle today, I unexpectedly came upon an American Golden-Plover mixed in with the Killdeer (many), Dunlin (16), and Lesser Yellowlegs (2).  I had taken the Critical Area Driving Tour shortly after it opened at 10am.  All the shorebirds were in the last field on the left before exiting the tour.  I believe this is the same field described by Jeff Shenot in his post on Saturday's birds, i.e. the first one if you're coming from the Merkle side.

John Hubbell
Washington DC