Belisle, also known as Allen Plant Raw Water or North Reservoir, is a water supply dam located in Arapahoe County, Colorado. Built in 1953, this earth dam stands at a height of 30 feet and stretches 3050 feet in length, with a storage capacity of 398 acre-feet. Situated on Big Dry Creek-OS, Belisle serves as a crucial water source for the city of Englewood and is regulated by the Colorado Department of Water Resources.

The dam's primary purpose is water supply, with a spillway width of 2 feet and a maximum discharge rate of 27 cubic feet per second. Despite being classified as having a significant hazard potential, Belisle is currently assessed to be in fair condition. It undergoes inspections every two years to ensure its structural integrity and safety. With its moderate risk level and adherence to state regulations for permitting, inspection, and enforcement, Belisle plays a vital role in maintaining water resources in the region.

Water resource and climate enthusiasts can appreciate Belisle's contribution to water supply infrastructure in Colorado. As a locally-owned dam serving the community with a regulated operation, Belisle exemplifies the importance of maintaining and managing water resources effectively. Its strategic location on Big Dry Creek-OS and adherence to state regulations demonstrate a commitment to sustainable water management practices in the face of changing climate conditions.