Hetch Hetchy Reservoir is a large water storage facility located in the Sierra Nevada mountains of California. It was created by damming the Tuolumne River and is part of the Hetch Hetchy Water System, which supplies drinking water to the San Francisco Bay Area. The reservoir is surrounded by stunning natural scenery, including granite cliffs and diverse wildlife. The reservoir was completed in 1923 and has a capacity of about 117,000 acre-feet of water. It plays a crucial role in providing water for both residential and commercial use. Additionally, the area is popular for outdoor activities such as hiking and fishing, attracting visitors to its beautiful landscapes.