San Francisco City Engineer.
Hetch Hetchy Water Supply.
Projects.
Commercial views of O’Shaughnessy Dam and Hetch Hetchy Reservoir.
San Francisco City Engineer.
Hetch Hetchy Water Supply.
Projects.
Moccasin Powerhouse and Dam.
San Joaquin Pipelines.
Bay Division Pipelines.
San Francisco City Engineer.
Hetch Hetchy Water Supply.
Visitors, Staff, Crews and Other Personnel.
Visitors, staff, crews and other personnel.