Upper Peak Lake, also known as Cascade Lakes, is a privately owned reservoir located in Placer, California, specifically in the city of Washington. Positioned along the South Yuba River, this hydroelectric dam stands at a height of 39 feet and has a hydraulic height of 35 feet. With a dam length of 214 feet and a storage capacity of 1730 acre-feet, Upper Peak Lake serves as a vital water resource in the region, providing essential hydroelectric power to the area.

Constructed in 1850, Upper Peak Lake has a significant hazard potential, with a risk assessment rating of moderate (3). The dam is regulated by the Federal Energy Regulatory Commission, ensuring that it meets safety standards and undergoes regular inspections to mitigate any potential risks. Although the condition assessment is currently not available, emergency action plans are in place to address any unforeseen events and protect the surrounding community from potential hazards.

With a surface area of 21.1 acres and a drainage area of 0.2 square miles, Upper Peak Lake plays a crucial role in water management and climate resilience efforts in the region. As climate change continues to impact water resources, the proper maintenance and regulation of dams like Upper Peak Lake are essential for ensuring water security and disaster preparedness in the face of changing environmental conditions.