Skip to content

Portal Powerhouse | Collections | The Huntington

Membership

Donate

Store

OPEN TODAY: 10 A.M.–5 P.M.

Home
Collections
Search
Southern California Edison collection of negatives and photographs
Portal Powerhouse

Visual Materials

Portal Powerhouse

Description: Portal Powerhouse - Foundation excavation in firm decomposed granite draft tube side of powerhouse. Excavation approx. 1' above final grade.
Type: Visual Materials(Opens in new tab)
Date: 8/15/1955
Call number: photCL SCE 02 - 43546
Find out more: View in the Huntington Digital Library(Opens in new tab); View in the Library catalog(Opens in new tab)

Subscribe to our e-newsletter

About
Accessibility
Land Acknowledgment
Using the Library
Careers
Host an Event
Volunteer
Press
Contact Us
Filming/Photography

Opening Hours

Daily: 10 A.M.–5 P.M.

Closed on Tuesdays

Admission Info and Tickets

1151 Oxford Road
San Marino, CA 91108

Privacy Policy
Social Media Guidelines and User Policy

©2026 The Huntington

Charity Navigator

You might also be interested in

Portal Powerhouse
Visual Materials
Portal Powerhouse - View of forming for substructure concrete, showing neat excavation in tight decomposed granite for the draft tube encasement.
photCL SCE 02 - 43623
Portal Powerhouse
Visual Materials
Portal Powerhouse - First stage of Surge Tank excavation. Rock near top is decomposed granite.
photCL SCE 02 - 44604
Portal Powerhouse
Visual Materials
Portal Powerhouse - Excavation in inlet channel near vertical shaft north-west approx. 18' above bottom grade.
photCL SCE 02 - 43547
Portal Powerhouse
Visual Materials
Portal Powerhouse - Channel cut in decomposed granite at outfall from Rancheria Creek to tailrace channel.
photCL SCE 02 - 43729
Portal Powerhouse
Visual Materials
Portal Powerhouse - First concrete around draft tube.
photCL SCE 02 - 43708
Portal Powerhouse
Visual Materials
Portal Powerhouse - First concrete around draft tube.
photCL SCE 02 - 43709