In the middle of the fast-flowing Chilkoot River, an Alaska state employee sits on a small perch over a narrow, fence-like structure and stares down into the rush of water. In the middle of the fast-flowing Chilkoot River, an Alaska state employee sits on a small perch over a narrow, fence-like structure and stares down into the rush of water. Plants & Animals Ecology Phys.org – latest science and technology news stories