Cunning Reservoir Report

Last Updated: December 5, 2025

Cunning is a local government-owned Earth dam located in Brighton, Colorado, with a primary purpose of irrigation.


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Summary

Built in 1935, it stands at a height of 13 feet and has a storage capacity of 50 acre-feet. The dam spans a length of 600 feet and is situated on the Brantner Gulch-OS river or stream, serving as a crucial water resource for the surrounding area.

Despite being classified with a low hazard potential and satisfactory condition assessment, Cunning undergoes inspections every six years to ensure its structural integrity and safety. The dam features an uncontrolled spillway with a width of 15 feet and has a maximum discharge capacity of 315 cubic feet per second. With a moderate risk assessment rating of 3, the dam's risk management measures and emergency preparedness protocols are continually evaluated to mitigate potential hazards and ensure the safety of the community.

Water resource and climate enthusiasts will find Cunning to be a fascinating case study in dam infrastructure and management. As a vital component of the local irrigation system, this Earth dam plays a crucial role in water storage and distribution, highlighting the intersection of human engineering with environmental sustainability. Its location in the picturesque Adams County, Colorado, adds to the significance of Cunning as a key water resource facility in the region, showcasing the intricate balance between human needs and natural ecosystems in the face of changing climate patterns.

Year Completed

1935

Dam Length

600

Dam Height

13

River Or Stream

BRANTNER GULCH-OS

Primary Dam Type

Earth

Surface Area

5

Hydraulic Height

13

Nid Storage

50

Structural Height

13

Hazard Potential

Low

Nid Height

13
       
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.