Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Charging Skip-loader with concrete thru hole in top of 12' pipe, outside tunnel portal.
Type: Visual Materials(Opens in new tab)
Date: 9/3/1955
Call number: photCL SCE 02 - 43693
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 - Concreting pipe supports in Ward Tunnel. Skip-loader delivering concrete to buggies on runway.
photCL SCE 02 - 43692
Portal Powerhouse
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Portal Powerhouse - Forebay - Mucking skip-loader, inlet channel.
photCL SCE 02 - 43766
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Portal Powerhouse - Forebay - Excavating trench thru damp area in original ground downstream from relief hole R-24, for installation of perforated pipe drain.
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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.
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Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Progress picture showing placement of upstream impervious fill in sluice pipe area, to top of 24" sluice pipe concrete encasement.
photCL SCE 02 - 43327
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