It was a late in the season nest, most likely a 2nd attempt with only one youngster seen.
It grew quickly as the summer progressed with the parents bringing lots of catfish for the young eagle as seen in the video below.
Bald Eagle at Nest - Newburyport, MA - July 25, 2010 from Phil Brown on Vimeo.
This video shows one of the adult eagles at the nest with a catfish in it's talons. The young eagle showed no interest in the fish which the adult dropped into the nest before flying off.
3 weeks after the 1st image.
Mid August just after fledging.
and one of the adults from early in the nesting process