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Visual Materials

Portal Powerhouse - Forebay

Description: Portal Powerhouse - Forebay - Completed concrete encasement around 24" diameter sluice pipe through rock fill downstream section.
Type: Visual Materials(Opens in new tab)
Date: 8/4/1955
Call number: photCL SCE 02 - 43536
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 - Forebay
Visual Materials
Portal Powerhouse - Forebay - Sluice pipe and encasement viewed from downstream.
photCL SCE 02 - 43613
Portal Powerhouse - Portal Forebay
Visual Materials
Portal Powerhouse - Portal Forebay - Downstream side of dam showing outlet end of 24" sluice pipe.
photCL SCE 02 - 43786
Portal Powerhouse - Forebay
Visual Materials
Portal Powerhouse - Forebay - First rock fill in sluice pipe area. Note silty surface mud being pushed immediately ahead of placement rock.
photCL SCE 02 - 43324
Portal Powerhouse - Forebay
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Portal Powerhouse - Forebay - View from downstream of sluice pipe foundation excavation.
photCL SCE 02 - 43588
Portal Powerhouse - Forebay
Visual Materials
Portal Powerhouse - Forebay - Placing first fill in impervious section under location of sluice pipe. Note dozer pushing layer of saturated & disturbed surface material, exposing firm foundation, before fill placement.
photCL SCE 02 - 43315
Portal Powerhouse - Forebay
Visual Materials
Portal Powerhouse - Forebay - View from right abutment showing site preparation for downstream rock fill portion of the dam.
photCL SCE 02 - 43306