Groth Pumping System Reservoir Report

Last Updated: December 5, 2025

The Groth Pumping System, located in Larimer County, Colorado, is a privately owned irrigation facility built in 1951 along the Indian Creek.


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Summary

This Earth-type dam stands at a height of 20 feet and has a storage capacity of 85 acre-feet, with a normal storage level of 50 acre-feet. Its primary purpose is for irrigation, serving the agricultural needs of the surrounding area.

Despite being a low hazard potential structure with a fair condition assessment, the Groth Pumping System is regulated by the Colorado Division of Water Resources and undergoes regular inspections for safety and compliance. The dam has a maximum discharge capacity of 1000 cubic feet per second and features an uncontrolled spillway with a width of 50 feet. Its location in Windsor, Colorado, makes it an essential component of the local water resource management system.

With a moderate risk assessment rating of 3, the Groth Pumping System plays a crucial role in supporting the agricultural activities in the region by providing reliable water access for irrigation. As climate change continues to impact water resources, the maintenance and management of such infrastructure become increasingly vital for sustainable water use and environmental conservation. The Groth Pumping System serves as a reminder of the importance of effective water resource management in the face of changing climate conditions.

Year Completed

1951

Dam Length

750

Dam Height

20

River Or Stream

INDIAN CREEK

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

20

Drainage Area

24

Nid Storage

85

Structural Height

20

Hazard Potential

Low

Nid Height

20
       
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.