Regan is a private fish and wildlife pond located in Hinsdale, Colorado, specifically in South Fork. This earth dam structure was completed in 1906 and has a height of 17 feet and a length of 80 feet, providing a storage capacity of 1007 acre-feet. The dam serves multiple purposes, including fish and wildlife preservation and recreational activities, with a surface area of 141 acres and a drainage area of 1 square mile.

Despite being classified as having a low hazard potential, Regan is deemed to have a high risk due to specific factors, as evaluated in a risk assessment. The dam's condition assessment in 2014 rated it as fair, and it has a regular inspection frequency of every 6 years. The structure does not have a spillway and is not associated with any locks or outlet gates. Although the dam meets state regulations and permitting requirements, it lacks certain emergency preparedness measures, such as an Emergency Action Plan (EAP) and inundation maps.

For water resource and climate enthusiasts, Regan presents an intriguing case study of a century-old earth dam serving as a vital habitat for fish and wildlife in the House Canyon Creek watershed. The dam's historical significance, combined with its risk assessment results and emergency preparedness gaps, highlight the ongoing challenges and opportunities in managing and maintaining aging infrastructure for environmental conservation and public safety in Colorado's diverse landscape.