Bear River Dam is a dam in Amador County, California, due east of Sacramento. The rockfill dam was constructed in 1900 with a height of 83 feet, and a length of 748 feet at its crest. It impounds the Bear River for hydroelectric power generation and municipal water supply. It is owned and operated by Pacific Gas and Electric Company, the largest privat…Bear River Dam is a dam in Amador County, California, due east of Sacramento. The rockfill dam was constructed in 1900 with a height of 83 feet, and a length of 748 feet at its crest. It impounds the Bear River for hydroelectric power generation and municipal water supply. It is owned and operated by Pacific Gas and Electric Company, the largest private owner of hydroelectric facilities in the United States, making it one of the company's 174 dams.