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Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Extent of washing due to high water in Potter Creek.
Type: Visual Materials(Opens in new tab)
Date: 5/18/1956
Call number: photCL SCE 02 - 44559
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 - Cut bank in rear of powerhouse structure showing extent of minor washing due to overflow of seepage water into excavation.
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Portal Powerhouse - Potter Creek undermined 2 to 5 feet.
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Portal Powerhouse - Potter Creek culvert washed out.
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Portal Powerhouse - Enlarging Potter Creek channel to handle tunnel flow during excavation of tail race channel.
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Portal Powerhouse - Continuance of washing daused by break-through of seepage water from diversions. Discharge was reduced to eliminate auxiliary spill in pipe.
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