The spillway is where I do expect to find winter migrants. There were lots of ring-bills which is normal. The big brown gull is a 1st winter herring gull. In the back on the left is a little guy with a black swoosh mark over his eye. This is a forster's tern.
Forster's Tern (Sterna forsteri)
1st Winter Herring Gull (Larus argentatus)
Ring Billed Gull (Larus delawarensis)