This photo isn't best quality, but at least I can document that I also saw some Northern Shovelers on the pond.
Another pond dweller I can document was this Canvasback. (lifer!)
Here is another lifer for me, and the only photo I could get of this ring-necked duck. Don't you like his "crew cut" hairstyle? I'm not absolutely positive of its ID, but I could not find another duck in my field guide with that two-tone bill.