Categories Timeline Hetch Hetchy Valley Post author By paul Post date January 19, 2000 No Comments on Hetch Hetchy Valley 1913 Congress authorized the dam at Hetch Hetchy Valley in Yosemite National Park ← Lakeview Gusher → John Muir Trail Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *Comment Name * Email * Website