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Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Diverting tunnel flow from Rancheria Creek channel across main channel and into Potter Creek channel.
Type: Visual Materials(Opens in new tab)
Date: 7/23/1955
Call number: photCL SCE 02 - 43308
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 - Tailrace channel from highway bridge. Approx. 1850 cfs flow from Ward Tunnel and Rancheria Creek.
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Portal Powerhouse - View of tunnel diversion during test flow of 490 cfs. Flow in diversion ditch from 12' pipe to junction with Rancheria Creek channel.
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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 - Starting to fill Potter Creek temporary diversion channel after returning tunnel flow to permanent tailrace.
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Portal Powerhouse - Flow down diversion channel from 12' pipe to Rancheria Creek during 490 c.f.s. test flow.
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