Hertha Reservoir Report

Last Updated: December 5, 2025

Hertha, also known as Seven Lakes, is a privately owned irrigation structure located in Larimer County, Colorado.


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Summary

Managed by the Natural Resources Conservation Service, this Earth-type dam was completed in 1958 and stands at a height of 32 feet with a hydraulic height of 24 feet. With a storage capacity of 2447 acre-feet, Hertha serves the primary purpose of irrigation and covers a surface area of 116 acres. Despite being uncontrolled, the dam has a spillway width of 13 feet to manage potential overflow.

The dam's condition was last assessed in August 2020 and was found to be satisfactory, with a significant hazard potential. Regular inspections are conducted every two years to ensure its structural integrity. The risk assessment for Hertha is moderate, with measures in place to manage any potential risks. Located in the Dry Creek watershed, this dam plays a crucial role in water resource management in the region and contributes to the overall agricultural landscape in Berthoud.

Hertha's presence highlights the importance of efficient water management in the face of changing climate patterns. As a key piece of infrastructure in the Omaha District, this dam showcases the collaborative efforts between private owners, regulatory agencies, and designers to ensure the safety and sustainability of water resources in Colorado. With its storied history and ongoing maintenance efforts, Hertha stands as a testament to the resilience of water structures in the face of environmental challenges.

Year Completed

1958

Dam Length

3675

Dam Height

32

River Or Stream

DRY CREEK-TR

Primary Dam Type

Earth

Surface Area

116

Hydraulic Height

24

Nid Storage

2447

Structural Height

32

Hazard Potential

Significant

Nid Height

32
       
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.