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Visual Materials

Portal Powerhouse - Forebay

Description: Portal Powerhouse - Forebay - Impervious fill upstream and start of rock fill in sluicepipe area of forebay dam.
Type: Visual Materials(Opens in new tab)
Date: 7/27/1955
Call number: photCL SCE 02 - 43322
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 - View from station 5+00, looking toward left abutment, showing outcroppings of ledge rock while excavating for upstream cutoff under impervious section.
photCL SCE 02 - 43311
Portal Powerhouse - Forebay
Visual Materials
Portal Powerhouse - Forebay - View from left abutment showing completed foundation preparation under a portion of rock fill section. Shovel and Dozer excavating in upstream cutoff.
photCL SCE 02 - 43304
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
Visual Materials
Portal Powerhouse - Forebay - Placing impervious blanket on morane slope upstream from right abutment.
photCL SCE 02 - 43534
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
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