Portal Powerhouse

Description: Portal Powerhouse - First stage of Surge Tank excavation. Rock near top is decomposed granite.
Type: Visual Materials(Opens in new tab)
Date: 6/28/1956
Call number: photCL SCE 02 - 44604
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 - Foundation excavation in firm decomposed granite draft tube side of powerhouse. Excavation approx. 1' above final grade.
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Portal Powerhouse
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Portal Powerhouse - Surge Tank excavation.
photCL SCE 02 - 44602
Portal Powerhouse
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Portal Powerhouse - Surge Tank excavation.
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Portal Powerhouse - Excavation for spill pipe of Surge Tank.
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Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - Evidence of bed rock exposed by excavation between Stations 2+00 & 3+00, near the left abutment and along dam axis.
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