A gem from the Hetch Hetchy construction contract No. 61 proposal is a plan showing proximity of the construction crew camp to the proposed dam site. In the lower left quadrant of the drawing, the tramway location is reaching down from the loop of Hetch Hetchy Railroad upslope.

Other interesting features in the drawing depict elements of the construction cam. Life support resources include: various Bunkhouses and Cottages, a Dining Room, and a Hospital. Construction resources identified in the drawing include: a Warehouse, a Blacksmith Shop, a Compressor Plant, the Quarry Zone, and a Powder House (situated well away from living quarters in the lower right quadrant of the drawing).

The intended location of the dam (also in the lower left quadrant) is shown as a simple line drawing. And the diversion tunnel for Tuolumne water is seen “intersecting” the right portion of the dam.
Perhaps the most fun (or awkward) element in the drawing is the item to the right of center of the drawing. That is the Hog Corral.

The following news item is from the San Francisco “Municipal Record” of March 1917 describing O’Shaughnessy’s plans for the tramway that would run people and materials from the construction camp to the dam site:

The Hetch Hetchy Railroad (HHRR) was a 68-mile standard gauge Class III railroad constructed by the City of San Francisco to support the construction of the O’Shaughnessy Dam.

Based in Groveland, the HHRR operated from 1917 to 1949. It primarily carried construction crews and materials, but also took excursion passengers, freight, and mail. The line extended from its western terminus at Hetch Hetchy Junction (meeting the Sierra Railroad) at an elevation of 1,000 feet, reaching a peak of 5,064 feet at Poopenaut Pass, and ending at about 3,800 feet on the rim of the Hetch Hetchy Valley above the construction site.