Dyekman Reservoir Report

Last Updated: December 5, 2025

Dyekman is a private earth dam located in Larimer, Colorado, with a primary purpose of irrigation.


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Summary

Constructed in 1902, this dam stands at a height of 10 feet and stretches 600 feet in length, providing a storage capacity of 80 acre-feet. Situated on the Big Thompson River-OS, Dyekman plays a crucial role in water resource management in the region, with a low hazard potential and a high risk assessment rating.

Despite being last inspected in 1980, Dyekman is regulated and permitted by the Colorado Division of Water Resources, ensuring that it meets state standards for safety and functionality. While its condition is currently rated as "Not Rated," the dam's risk management measures and emergency preparedness remain unclear. As climate change continues to impact water resources, the maintenance and upkeep of structures like Dyekman are essential for mitigating risks and ensuring the sustainable use of water for irrigation and other purposes in the future.

Year Completed

1902

Dam Length

600

Dam Height

10

River Or Stream

BIG THOMPSON RIVER-OS

Primary Dam Type

Earth

Surface Area

16

Hydraulic Height

10

Nid Storage

80

Structural Height

10

Hazard Potential

Low

Nid Height

10
       
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.