Upper Beaver Brook, also known as John Roscoe, is a local government-owned dam in Colorado, specifically in Clear Creek County near Golden. This earth dam, completed in 1924, primarily serves as a water supply source with a storage capacity of 587 acre-feet. The dam stands at 88 feet high, with a hydraulic height of 52 feet and a structural height of 97 feet, controlling the flow of Beaver Brook and covering a surface area of 16 acres.

With a maximum discharge capacity of 24,239 cubic feet per second, Upper Beaver Brook has an uncontrolled spillway width of 80 feet. The dam's hazard potential is categorized as high, although its condition is assessed as satisfactory as of May 2020. Despite being state-regulated and permitted, the dam poses a moderate risk (rated 3 out of 5) and is subject to regular inspections to ensure public safety.

Upper Beaver Brook plays a crucial role in water resource management in the region, highlighting the intersection of infrastructure, climate, and environmental conservation. As a key element in the water supply system, it underscores the importance of sustainable dam operation and maintenance practices to mitigate potential risks and ensure the continued availability of water resources in the face of changing climate conditions.