Humphreys Reservoir Report

Last Updated: December 5, 2025

Humphreys is a private dam located in Mineral County, Colorado, specifically in the city of 4UR Ranch.


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Summary

Built in 1923, this concrete dam stands at a height of 85 feet and has a length of 186 feet, with a storage capacity of 842 acre-feet and a drainage area of 53 square miles. The dam is situated on Goose Creek and is under the regulatory authority of the Colorado Department of Water Resources (DWR) as well as the Federal Energy Regulatory Commission (FERC).

With a hazard potential classified as high, Humphreys poses a risk that has been assessed as moderate. While the condition assessment is not available, the dam undergoes regular inspections, with the last one being conducted in September 2020. Despite its age, Humphreys remains a crucial structure for water resource management in the area, providing storage and flood control services to the surrounding community. As a significant feature in the local landscape, the dam plays a vital role in maintaining the ecological balance of the region.

As a key component of the water infrastructure in Mineral County, Humphreys plays a crucial role in water resource management and climate resilience efforts. With its storage capacity, flood control measures, and regulatory oversight, the dam serves as a valuable asset for the community. As water resource and climate enthusiasts, understanding the role of structures like Humphreys is essential in ensuring sustainable water management practices and building resilience in the face of changing environmental conditions.

Year Completed

1923

Dam Length

186

Dam Height

85

River Or Stream

Goose Creek

Primary Dam Type

Concrete

Surface Area

44

Drainage Area

53

Nid Storage

842

Hazard Potential

High

Nid Height

85
       
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.