OPEN TODAY: 10 A.M.–5 P.M.

Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Silt layer exposed in excavating for upstream cutoff upstream from upstream toe.
Type: Visual Materials(Opens in new tab)
Date: 7/23/1955
Call number: photCL SCE 02 - 43312
Find out more: View in the Huntington Digital Library(Opens in new tab); View in the Library catalog(Opens in new tab)

You might also be interested in

Portal Powerhouse
Visual Materials
Portal Powerhouse - Forebay - Foundation excavation in vicinity of sluice pipe. Picture covers from axis to upstream toe. Dragline excavating for impervious cut-off upstream from toe to lessen seepage.
photCL SCE 02 - 43310
Portal Powerhouse - Forebay
Visual Materials
Portal Powerhouse - Forebay - Exposed bedrock in upstream cutoff between Stations 3+50 and 4+25.
photCL SCE 02 - 43318
Portal Powerhouse - Forebay
Visual Materials
Portal Powerhouse - Forebay - Upstream toe of rock fill section of forebay dam showing pervious filter layer in place between rock fill and impervious sections of embankment.
photCL SCE 02 - 43549
Portal Powerhouse - Forebay
Visual Materials
Portal Powerhouse - Forebay - View from station 5+00, looking toward left abutment, showing outcroppings of ledge rock while excavating for upstream cutoff under impervious section.
photCL SCE 02 - 43311
Portal Powerhouse - Forebay
Visual Materials
Portal Powerhouse - Forebay - View from left abutment showing completed foundation preparation under a portion of rock fill section. Shovel and Dozer excavating in upstream cutoff.
photCL SCE 02 - 43304
Portal Powerhouse
Visual Materials
Portal Powerhouse - Progress picture Portal, Phoenix Const. Co., rock crusher at left. [Ward Tunnel outlet and exposed section upstream where cut will be made for diversion]
photCL SCE 02 - 43272