Windsor #8 Reservoir Report

Last Updated: December 5, 2025

Windsor #8, located in Larimer, Colorado, is a privately owned earth dam completed in 1903 for irrigation purposes along the Cache La Poudre River.


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Summary

With a dam height of 54 feet and a storage capacity of 11,031 acre-feet, this structure plays a vital role in water management in the region. The dam has undergone structural modifications in 1981 and 2003 to ensure its continued functionality.

Despite its age, Windsor #8 has been assessed as being in satisfactory condition, with a high hazard potential but a moderate risk assessment rating. Regular inspections are conducted, with the most recent one taking place in May 2020, to ensure the dam's safety and reliability. The dam also serves recreational purposes in addition to irrigation, highlighting its importance in the local community for water resource management and outdoor activities along the river. With its historical significance and ongoing maintenance efforts, Windsor #8 continues to be a key feature in the water infrastructure of the area.

Years Modified

1981 - Structural, 2003 - Structural

Year Completed

1903

Dam Length

5200

Dam Height

54

River Or Stream

CACHE LA POUDRE RIVER-TR

Primary Dam Type

Earth

Surface Area

392

Hydraulic Height

54

Drainage Area

1

Nid Storage

11031

Structural Height

56

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

56
       
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.