Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Continuance of washing daused by break-through of seepage water from diversions. Discharge was reduced to eliminate auxiliary spill in pipe.
Type: Visual Materials(Opens in new tab)
Date: 1/21/1956
Call number: photCL SCE 02 - 43962
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
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Portal Powerhouse - Photo taken shortly after break-through of diversion ditch seepage into tailrace to south of Powerhouse.
photCL SCE 02 - 43932
Portal Powerhouse
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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
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Portal Powerhouse - Excavation for spill pipe of Surge Tank.
photCL SCE 02 - 44605
Portal Powerhouse
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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
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Portal Powerhouse - Close-up of 1500 cfs discharge from end of by-pass pipe - unrestricted end area.
photCL SCE 02 - 43913
Portal Powerhouse - Water trapped during night around powerhouse structure
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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