Egeria Reservoir Report

Last Updated: December 5, 2025

Egeria, located in Toponas, Colorado, is a privately owned earth dam built in 1902 for irrigation purposes on Egeria Creek-OS.


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Summary

The dam stands at a height of 21 feet with a hydraulic height of 20 feet and a length of 500 feet, providing a storage capacity of 243 acre-feet. It has a spillway width of 10 feet and a maximum discharge capacity of 100 cubic feet per second. Egeria underwent modifications in 1946 to enhance its hydraulic, mechanical, and structural components.

Despite being classified as having a low hazard potential, Egeria is in fair condition and undergoes inspections every six years. The dam has a moderate risk assessment level of 3, prompting the need for risk management measures to be implemented. The last inspection in October 2018 confirmed its stable condition, but ongoing monitoring and maintenance are essential to ensure the safety and efficiency of this vital water resource infrastructure in Routt County, Colorado. Water resource and climate enthusiasts can appreciate Egeria's historical significance in supporting agricultural irrigation while highlighting the importance of sustainable dam management practices in the face of changing environmental conditions.

Years Modified

1946 - Hydraulic, 1946 - Mechanical, 1946 - Structural

Year Completed

1902

Dam Length

500

Dam Height

21

River Or Stream

EGERIA CREEK-OS

Primary Dam Type

Earth

Surface Area

26

Hydraulic Height

20

Drainage Area

1

Nid Storage

243

Structural Height

21

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

21
       
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.