Mill Creek No 2 Reservoir Report

Last Updated: December 4, 2025

Mill Creek No 2, located in Hinsdale, Colorado, is a Federal-owned earth dam completed in 1955 for recreational purposes.


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Summary

Standing at a height of 18 feet with a hydraulic height of 14 feet, this dam on Mill Creek has a storage capacity of 20 acre-feet and a maximum discharge of 280 cubic feet per second. The dam, managed by the USDA Forest Service, is regulated and inspected by the Colorado Department of Water Resources to ensure its safety and compliance with state standards.

Despite being classified as having "Significant" hazard potential, Mill Creek No 2 is currently rated as "Not Rated" in terms of its condition assessment. The dam does not have an Emergency Action Plan (EAP) in place, and its risk assessment is moderate. With the last inspection date dating back to September 2010, there is a need for updated emergency preparedness measures and maintenance to mitigate potential risks associated with this dam. As climate change continues to impact water resources, it is crucial for stakeholders to prioritize the monitoring and maintenance of dams like Mill Creek No 2 to ensure the safety of surrounding communities and the environment.

Year Completed

1955

Dam Length

210

Dam Height

18

River Or Stream

MILLCREEK

Primary Dam Type

Earth

Hydraulic Height

14

Drainage Area

2

Nid Storage

20

Structural Height

23

Hazard Potential

Significant

Nid Height

23
       
Seasonal Comparison

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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.