Regan Reservoir Report

Last Updated: December 4, 2025

Regan is a private fish and wildlife pond located in Hinsdale, Colorado, specifically in South Fork.


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Summary

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.

Year Completed

1906

Dam Length

80

Dam Height

17

River Or Stream

HOUSE CANYON CREEK

Primary Dam Type

Earth

Surface Area

141

Hydraulic Height

16

Drainage Area

1

Nid Storage

1007

Structural Height

16

Hazard Potential

Low

Nid Height

17
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.