I saw several Solitary Sandpipers at Harford Glen park in Harford County, MD in May 2008.

Note how much smaller the Solitary Sandpiper is than the nearby Yellowlegs.

I think these are Solitary Sandpipers. I saw them at Cape May, NJ on August 16th, 2008.

This bird was at Harford Glen on April 30th, 2011.

I saw this one in the new impoundment at Swan Harbor on July 22nd, 2012.

This one was in the same place on August 4th, 2012.

I saw two at Swan Harbor on August 3rd, 2014.