Visual Materials
Portal Powerhouse
- Description
- Portal Powerhouse - Rock fill dike across Rancheria Creek to form detention pond for surge overflow.
- Date
- 9/22/1956
- Call number
- photCL SCE 02 - 44818
Visual Materials
Daily: 10 A.M.–5 P.M.
Closed on Tuesdays
1151 Oxford Road
San Marino, CA 91108
Visual Materials
Big Creek, Huntington Lake Dams - Rock detention dike across Rancheria Creek approx. 1000 feet upstream from Portal Powerhouse Dike constructed to create stilling basin for overflow from surge chamber. Flow about 2 cfs.
photCL SCE 02 - 44836
Visual Materials
Portal Powerhouse - Outlet end and anchor on concrete overflow pipe from surge chamber.
photCL SCE 02 - 44819
Visual Materials
Portal Powerhouse - Forebay - Progress picture placing fill in dike embankment.
photCL SCE 02 - 43550
Visual Materials
Portal Powerhouse - First stage of Surge Tank excavation. Rock near top is decomposed granite.
photCL SCE 02 - 44604
Visual Materials
Portal Powerhouse - Diverting tunnel flow from Rancheria Creek channel across main channel and into Potter Creek channel.
photCL SCE 02 - 43308
Visual Materials
Portal Powerhouse - Forebay - Impervious fill upstream and start of rock fill in sluicepipe area of forebay dam.
photCL SCE 02 - 43322