Hi All, I would like to respond to a good question about the size of Bald Eagle nests. As you might imagine nests vary in size. An average nest ranges from 1.5 to 1.8m (4.9 to 5.9 ft.) in diameter and 0.7 to 1.2 m (2.3 to 3.9 ft.) in height. Nests sometimes increase in size over time as eagles renest and continue to add nest materials. They are built either on cliffs or near the top of a large tree where they are supported by a set of large branches and interwoven sticks. The Bald Eagle nest that we observe on the web cam appears to be on the larger side. This is an estimate because I have only viewed the nest from the ground.
Patrick Keenan,BioDiversity Research Institute
reference: Buehler, D. A. 2000. Bald Eagle (Haliaeetus leucocephalus
The Birds of North America, No. 506 (A. Poole and F. Gill, eds.). The Birds of North America, Inc, Philadelphia, PA