Chimney Peak Ranch Reservoir Report

Last Updated: December 4, 2025

Chimney Peak Ranch, also known as Forgotten Reservoir, is a state-regulated water structure located in Ouray, Colorado, along Nate Creek.


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Summary

This irrigation dam is primarily used for agricultural purposes and is classified as an earth dam with a stone core. With a height of 25 feet and a storage capacity of 50 acre-feet, the dam has a low hazard potential and a moderate risk assessment rating.

Managed by the Colorado Department of Water Resources (DWR), Chimney Peak Ranch undergoes regular inspections and enforcement to ensure its safety and compliance with state regulations. Despite its uncontrolled spillway type and lack of a condition assessment rating, the dam poses a low risk of failure. The surrounding area is considered to have a moderate risk level, but with proper risk management measures in place, the ranch continues to provide vital water resources for the local community while protecting against potential hazards.

Located within the Albuquerque District of the US Army Corps of Engineers, Chimney Peak Ranch stands as a testament to sustainable water resource management in the face of changing climates. With its strategic location and vital role in supporting agricultural activities, this dam serves as a valuable asset for both water resource enthusiasts and climate advocates seeking to protect and preserve our natural environment.

Dam Length

200

Dam Height

25

River Or Stream

NATE CREEK

Hydraulic Height

25

Nid Storage

50

Structural Height

25

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

25
       
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.