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Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - View of tunnel diversion during test flow of 490 cfs. Flow from 6'x12' opening in 12' pipe.
Type: Visual Materials(Opens in new tab)
Date: 7/15/1955
Call number: photCL SCE 02 - 43296
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 - 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 - Flow down diversion channel from 12' pipe to Rancheria Creek during 490 c.f.s. test flow.
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Portal Powerhouse - Temporary flow diversion from 12' pipe [Ward Tunnel]. Flow about 425 cfs..
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Portal Powerhouse - Tunnel flow approximately 1700 cfs. About 400cfs of flow comes from side opening in pipe.
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Portal Powerhouse - View showing leakage through tunnel dump fill from diversion ditch during 490 c.f.s. flow, spilling into pool at end of 12' pipe.
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