I've seen them around Delaware lake.  I know a spot where were one likes to nest, too.  Never taken an egg or disturbed her when I've seen her, though, other than to take a pic w/a crappy camera phone.  I hope she nests in the same place again this year.   
Here's a pic of the nest.   
Well, was gonna post a couple pics but can't freakin find them, now. Around  a dozen eggs this last time.