Can you see the nest in the photo above?
The close-up at right might help. (Thanks, John!)
Killdeer will lay eggs for the next couple of months just about anywhere, from the parking lots at DeKorte to ballfields to rooftops with gravel on them.
IF you see a Killdeer running around, feigning a broken wing, you are probably too close to its nest or its Killfawns.