Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Flattening south excavation slope between powerhouse site and tunnel diversion channel.
Type: Visual Materials(Opens in new tab)
Date: 8/9/1955
Call number: photCL SCE 02 - 43541
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 - South bank of powerhouse excavation with considerable seepage from tunnel diversion.
photCL SCE 02 - 43528
Portal Powerhouse
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Portal Powerhouse - Enlarging Potter Creek channel to handle tunnel flow during excavation of tail race channel.
photCL SCE 02 - 43302
Portal Powerhouse
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Portal Powerhouse - Tailrace channel excavation progress in section isolated by diverting tunnel discharge in Potter Creek Channel.
photCL SCE 02 - 43545
Portal Powerhouse
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Portal Powerhouse - Record pictures of tailrace channel during outage: Upper end of channel and lower end of tunnel diversion channel used during 1955.
photCL SCE 02 - 43798
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
Portal Powerhouse
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Portal Powerhouse - Starting to fill Potter Creek temporary diversion channel after returning tunnel flow to permanent tailrace.
photCL SCE 02 - 43686