F.P.C. Vol. 3, Projects 67 and 120 - Construction of Big Creek Powerhouse 3 and construction camps

Construction of Powerhouse 3 and construction camps 1 to 54. Views include Tunnel 3, including intake construction, portal adit Camp 36, Camp 35 adit, outlet portal; Penstock 3 portal structure and manifold, surge chamber, drill sharpeners, connecting 18' penstock to manifold, butterfly valve house, flume to railroad sluicing water at outlet; Tunnel 3 excavation; Surge chamber construction; Construction views of Powerhouse 3, installation of 3 penstocks, turbine and generator installations at No. 3; Construction of 220kV switchyard.