The solitary sandpiper was still present at Llama Lake in Sammamish, WA as of 1130, Saturday 14 AUG. I could not re-locate the Stilt Sandpiper today.
A photo of the Solitary Sandpiper:
http://www.flickr.com/photos/crappywildlifephotography/4891345617/

Rick Hibpshman
Issaquah, WA