Lewis Lake, located in San Miguel County, Colorado, is a privately-owned reservoir with a primary purpose of hydroelectric power generation. The dam, completed in 1904, is a rockfill structure standing at 16 feet high and stretching 190 feet in length. With a storage capacity of 175 acre-feet, the reservoir covers an area of 25 acres and is regulated by the Federal Energy Regulatory Commission.

Despite its low hazard potential, Lewis Lake has a moderate risk assessment rating, indicating potential concerns that require monitoring and management. The dam is inspected biennially, with the last assessment conducted in August 2018. It is equipped with an uncontrolled spillway measuring 12 feet in width, capable of discharging up to 100 cubic feet per second. The surrounding area, known for its scenic beauty, is a popular destination for water resource and climate enthusiasts.

Overall, Lewis Lake serves as a critical component of the hydroelectric infrastructure in Telluride, Colorado, contributing to the region's energy needs while also providing recreational opportunities for visitors. As a regulated structure under the oversight of the State and Federal agencies, the dam's operation, maintenance, and safety are closely monitored to ensure the protection of both the environment and the local community. With its historical significance and continued relevance in modern water management practices, Lewis Lake remains a notable landmark in the region.