Blog / Natural History / Other / Teaching / Videos The Hetch Hetchy Valley next to Yosemite! September 18, 2025 Teddy Rosevelt was president and he managed to protect Yosemite, the glorious canyon in California’s Sierra Nevada’s Mountains. That canyon had a companion, the one cut by the Tuolumne River in its own gorge just to the north. Rosevelt tried… Continue Reading