Hetch Hetchy Dam. Drainage wells formed of porous concrete blocks 3 ft. 3 in. square, with 15 in. square hole in center.

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Local Identifier: AAZ-2239
Title: Hetch Hetchy Dam. Drainage wells formed of porous concrete blocks 3 ft. 3 in. square, with 15 in. square hole in center.
Date: 1922-06
Creator: San Francisco History Center, San Francisco Public Library
Collection: California Photograph Collection
Collection Number: SFP 131
Location: San Francisco History Center, San Francisco Public Library
Shelf Location: Folder: CA. Water. Hetch Hetchy O’Shaughnessy. Construction
Type of Resource: still image
Physical Description: 1 photographic print: b&w ; 8 x 11 in.
Form: photographic prints
Use and Reproduction: Though not required of public domain images, if you want to credit the library as the source, please use the following statement: "From the San Francisco History Center, San Francisco Public Library" and provide a link back to the item on our Digital Collections site.
Rights Statement: In public domain.
Note: In the middle of view is an inspection well formed with dense concrete blocks, bisected by a contraction joint. June, 1922. Hetch Hetchy Dam. Close view of drainage wells of porous concrete blocks. June, 1922.
Language (code): eng
Cumulative Index and Finding Aids Note: https://oac.cdlib.org/findaid/ark:/13030/c8tt4z0b/
Genre (tgm): Photographs
LCSH Subjects: Concrete blocks
Dams--Drainage systems
Water-supply--California--San Francisco
Hetch Hetchy Reservoir (Calif.)--Photographs
Hetch Hetchy Valley (Calif.)--Photographs
Yosemite National Park (Calif.)--Photographs
Handle: http://hdl.handle.net/20.500.12352/islandora:219179