Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Overturned Bay Cities Crane due to failure of outrigger blocking.
Type: Visual Materials(Opens in new tab)
Date: 6/5/1956
Call number: photCL SCE 02 - 44612
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 - Excavating rock shot out of 15' plug. Left remaining at bottom of surge chamber shaft until after tunnel outage. D-4 [?] in tunnel loading into skip operated by Bay Cities Crane at top of shaft.
photCL SCE 02 - 44804
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.
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Portal Powerhouse - Failure of Steel splitter in Penstock Wye section.
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Portal Powerhouse - Closer view of [raising fallen] crane.
photCL SCE 02 - 44613
Portal Powerhouse
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Portal Powerhouse - Progress - powerhouse construction, mobile crane excavating foundation for by-pass section of building.
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Portal Powerhouse - Extent of washing due to high water in Potter Creek.
photCL SCE 02 - 44559