Riddle is a privately owned dam located in Larimer, Colorado, with a height of 25 feet and a length of 480 feet. Built in 1953, it serves multiple purposes such as water storage and flood control. The dam has a normal storage capacity of 16 acre-feet and covers a surface area of 4 acres, drawing water from a drainage area of 6 square miles.

Despite being classified as having a low hazard potential and a satisfactory condition assessment, Riddle is subject to state regulation, permitting, inspection, and enforcement by the Colorado Department of Water Resources. The dam features an uncontrolled spillway and has not been modified in recent years. It is situated in the Omaha District and falls under the jurisdiction of Congressman Joe Neguse.

Overall, Riddle presents a moderate risk level (3) and follows a regular inspection schedule with the last assessment conducted in July 2018. While it meets safety guidelines and has emergency action plans in place, the dam's risk management measures and inundation maps are not explicitly mentioned in the available data. For water resource and climate enthusiasts, Riddle offers a fascinating case study in dam infrastructure and regulatory oversight in the state of Colorado.