Cattail Pond Reservoir Report

Last Updated: December 5, 2025

Cattail Pond, located in Larimer County, Colorado, is a private irrigation pond regulated by the state Department of Water Resources.


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Summary

Built in 1900, this Earth-type dam stands at 7 feet high and stretches 1290 feet in length, with a storage capacity of 152 acre-feet. It serves the primary purpose of irrigation, drawing water from the Big Thompson River-TR.

Despite its low hazard potential and satisfactory condition assessment, Cattail Pond is subject to regular inspections every six years to ensure its safety and functionality. The spillway, which is uncontrolled with a width of 50 feet, can handle a maximum discharge of 900 cubic feet per second. The pond covers a surface area of 22 acres and has a normal storage capacity of 94 acre-feet, making it a vital resource for agricultural water management in the region.

Overall, Cattail Pond plays a crucial role in supporting irrigation activities in the area, with its moderate risk assessment indicating the need for ongoing monitoring and risk management measures to safeguard its integrity and ensure sustainable water resource management for the future.

Year Completed

1900

Dam Length

1290

Dam Height

7

River Or Stream

BIG THOMPSON RIVER-TR

Primary Dam Type

Earth

Surface Area

22

Hydraulic Height

7

Nid Storage

152

Structural Height

7

Hazard Potential

Low

Nid Height

7
       
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.