[Maine-birds] Loon ID help

I digiscoped a loon at the Cliff House in York, Maine. The bird was quite a ways out, so had to crop it a lot to get a better view.  What do you think it is?

 

Link to my  Flickr is : http://www.flickr.com/photos/22247688@N04/10597833455/in/photostream/

 

Thanks

Andy Aldrich

North Berwick