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Southern California Edison collection of negatives and photographs
Portal Powerhouse

Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Temporary backing to reduce vibration in 3/8" plate bulkhead in turbine Wye branch inadequate; it was replaced with concrete disc back by I-beams.
Type: Visual Materials(Opens in new tab)
Date: 10/27/1955
Call number: photCL SCE 02 - 43898
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
Visual Materials
Portal Powerhouse - Installing backing I-beams (15") prior to forming for concrete. Strengthening to reduce vibration during high flows.
photCL SCE 02 - 43902
Portal Powerhouse
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Portal Powerhouse - Installing temporary 3/8" plate bulkhead at end of turbine branch of penstock inside structure.
photCL SCE 02 - 43777
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Portal Powerhouse - Placing reinforcing steel for concrete disc, steel plate bulkhead.
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Portal Powerhouse - Butterfly valve attached to turbine nozzle - Penstock bulkhead still in place.
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Portal Powerhouse - Gravel accumulated during spring and summer diversion at lower end of Turbine Wye Branch of Penstock. Estimated amount approx. 2 cu. yards with gravel arranging from 3' to 4" in size.
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