Just inside the entrance to the Diversion Tunnel, one meets with a biosphere of live ferns growing in the cave like interior.
A look upward at Dworshak’s spillway. The dam’s height at 717’ is deceptive. People at the bottom look like tiny little twigs. The width of the dam across the base is 550’ and houses an elevator, and many hallways and tunnels.
This photograph shows the Diversion Tunnel under construction. Air lines went in to operate the jack hammers.