Coal Ridge Waste Dam #2, also known as Sand Hill Lake, is a privately owned structure located in Weld County, Colorado. Completed in 1954, this earth dam stands at 7 feet high and stretches 820 feet in length, with a storage capacity of 1382 acre-feet. The primary purpose of the dam is for irrigation, with additional benefits for recreational activities.

This dam is situated on Little Dry Creek, with a drainage area of 3 square miles. Although it has a low hazard potential and is currently in satisfactory condition, it is regulated by the Colorado Division of Water Resources, with regular inspections and enforcement measures in place. While it lacks a spillway, the dam has a risk assessment rating of 2, indicating a high level of risk that should be managed carefully.

Enthusiasts interested in water resources and climate will find Coal Ridge Waste Dam #2 a compelling structure with historical significance and potential implications for water management in the region. With its unique features and risk profile, this dam serves as a notable example of the intersection between infrastructure, environmental protection, and public safety.