Pictures 17 Puget Sound Power & Light Company, White River Hydroelectric Project, Dieringer Washington Tweet Surge tanks, looking south (1989) Surge tanks for Penstock No. 1, looking west (1989) Surge tank and valve for Penstock No. 2 (which is to the left), looking west (1989) Surge tank and valves for Exciter penstocks (which enter powerhouse below the air conditioning unit in center), looking north (1989) Transformers on roof; looking southeast (1989). Monitors and roof of powerhouse looking south (1989)