Portal Powerhouse

Description: Portal Powerhouse - Side spillway cut to relieve excessive back pressure during high flow. Final baffle now in place at end of penstock.
Type: Visual Materials(Opens in new tab)
Date: 11/21/1955
Call number: photCL SCE 02 - 43928
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 - 12' diameter pipe installed to reduce pressure at portal during high flows. At time, the lower baffle was still there at outlet restricting end area.
photCL SCE 02 - 43917
Portal Powerhouse - Discharge at side
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Portal Powerhouse - Discharge at side - channel spillway at approximately 1500 cfs flow thru tunnel.
photCL SCE 02 - 43918
Portal Powerhouse
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Portal Powerhouse - By-pass pipe after installation of three horizontal baffles. With flow of 1000 cfs, upper two baffles were lost, due to excessive vibration.
photCL SCE 02 - 43916
Portal Powerhouse - Flow test
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Portal Powerhouse - Flow test - Uncompleted penstock flow approximately 1300 cfs.
photCL SCE 02 - 43876
Portal Powerhouse - Forebay full
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Portal Powerhouse - Forebay full - Slight spill over Spillway Tunnel Flow.
photCL SCE 02 - 44598
Portal Powerhouse
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Portal Powerhouse - Tunnel flow approximately 1700 cfs. About 400cfs of flow comes from side opening in pipe.
photCL SCE 02 - 43881