Hetch Hetchy

I scanned this map from the Map and Geography Library at the University of Illinois with the intent making another reservoir piece from the data. If I remember right this topo map is from the 1940's but still shows the original contours underneath the Hetch Hetchy reservoir. Flooding of this valley caused a lot of controversy. The dam was completed in 1923 and the reservoir supplies about 25% of the drinking water to the San Francisco Bay Area (wikipedia). The reservoir is a little more than 100ft deep with the valley walls reaching 2000ft above the lake level. Since it is used for drinking water it cannot be used for boating, but there are trail close to the north shore. Next time I am in Yosemite I will hike that trail and maybe get a better sense of how I feel about the damming of this valley.