Possible alligator sighting in Brewer Creek

I left the Loch Haven marina just before 6:00 as the sun rose over a low-lying bank of clouds in the east and paddled up the South River into Pocohontas Creek and then up Brewer Creek to the culvert on Loch Haven Boulevard. I saw what I belive to be an alligator in Brewer Creek - at first I took it for a floating piece of wood but it dived when I approached and I'm convinced I saw a body and tail. I waited quietly and it soon surfaced but submerged again when I tried to approach. An alligator was spotted off the South River as much as a decade ago and an 8 foot long alligator was killed in Chesapeake Beach just last month, so it is very possible that what I saw really was a 'gator.