First, some more facts about the Bald Eagle: it is important in the US due to its symbolic status, and it used to be endangered and threatened up to 2007, and without conservation efforts it could have gone extinct.
Therefore, the conservation efforts are continuing, just to make sure that the species is not threatened again.
People hiking could endanger the animals: scare them, destroy their nests etc. That's why hiking is not allowed in the critical time: to allow the eagles engage in their roosting activities without obstacles
