Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - South bank of powerhouse excavation with considerable seepage from tunnel diversion.
Type: Visual Materials(Opens in new tab)
Date: 8/1/1955
Call number: photCL SCE 02 - 43528
Find out more: View in the Huntington Digital Library(Opens in new tab); View in the Library catalog(Opens in new tab)

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Portal Powerhouse
Visual Materials
Portal Powerhouse - Flattening south excavation slope between powerhouse site and tunnel diversion channel.
photCL SCE 02 - 43541
Portal Powerhouse
Visual Materials
Portal Powerhouse - Cut bank in rear of powerhouse structure showing extent of minor washing due to overflow of seepage water into excavation.
photCL SCE 02 - 43734
Portal Powerhouse
Visual Materials
Portal Powerhouse - Photo taken shortly after break-through of diversion ditch seepage into tailrace to south of Powerhouse.
photCL SCE 02 - 43932
Portal Powerhouse
Visual Materials
Portal Powerhouse - Start of diversion excavation. [exposing section of Ward Tunnel for diversion]
photCL SCE 02 - 43271
Portal Powerhouse - Water trapped during night around powerhouse structure
Visual Materials
Portal Powerhouse - Water trapped during night around powerhouse structure - due to failure of diversion pipe to carry increased seepage thru rack fill between tunnel diversion channel and bench at elevation.
photCL SCE 02 - 43733
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