Lake Aloha Main, also known as Medley Lakes Main, is a privately owned dam located in El Dorado County, California, near South Lake Tahoe. Built in 1917, this masonry dam stands at a height of 32 feet and serves multiple purposes including hydroelectric power generation and irrigation. With a storage capacity of 5063 acre-feet and a surface area of 630 acres, the dam is situated on the South Fork American River with a drainage area of 3.4 square miles.

Managed by the Federal Energy Regulatory Commission, Lake Aloha Main has a high hazard potential and is regulated by the state of California. The dam does not have a spillway and is inspected regularly to ensure its safety and integrity. Although its condition assessment is currently unavailable, the dam is deemed to have a high risk factor (2) according to the risk assessment conducted.

Overall, Lake Aloha Main is a significant structure in the region, contributing to water resource management and energy production. As an enthusiast of water resources and climate, exploring the history and operational aspects of this dam can provide valuable insight into the complex interplay between infrastructure, natural resources, and regulatory frameworks.