Lower Beaver Brook, also known as Beaver Brook #2, is a rockfill dam located in Golden, Colorado, with a primary purpose of water supply. Completed in 1903, this dam stands at a height of 39 feet and has a hydraulic height of 38 feet, providing a maximum storage capacity of 32 acre-feet. With a drainage area of 7 square miles and a spillway width of 29 feet, Lower Beaver Brook has a high hazard potential and is categorized as being in fair condition.

Managed by local government authorities and regulated by the Colorado Division of Water Resources, Lower Beaver Brook undergoes regular inspections to ensure its safety and functionality. Despite its moderate risk assessment rating of 3, the dam has not been significantly modified since its construction over a century ago. Situated along the Beaver Brook river, this essential water resource structure plays a crucial role in sustaining the surrounding community's water supply needs. For water resource and climate enthusiasts, Lower Beaver Brook serves as a fascinating example of early 20th-century engineering and the ongoing challenges of maintaining aging infrastructure in the face of evolving environmental conditions.