Evergreen Reservoir Report

Last Updated: December 5, 2025

Evergreen is a historic earth dam located in Jefferson County, Colorado, along Bear Creek.


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Summary

Built in 1927, this dam serves primarily for water supply purposes, with a storage capacity of 800 acre-feet and a normal storage of 669 acre-feet. The dam stands at a height of 41 feet, with a hydraulic height of 50 feet and a structural height of 47 feet. Its spillway, which is uncontrolled, has a width of 196 feet, and the dam has a drainage area of 101 square miles.

Despite being classified as having a high hazard potential, Evergreen is in fair condition as of its last assessment in September 2020. The dam has undergone modifications in 1980 to improve its structural integrity. With its moderate risk assessment level, the dam is closely regulated and inspected by the Colorado Division of Water Resources. As a popular recreational spot in the area, Evergreen is not only a vital water resource but also a scenic destination for outdoor enthusiasts to enjoy.

Years Modified

1980 - Structural

Year Completed

1927

Dam Length

380

Dam Height

41

River Or Stream

BEAR CREEK

Primary Dam Type

Earth

Surface Area

40

Hydraulic Height

50

Drainage Area

101

Nid Storage

800

Structural Height

47

Hazard Potential

High

Foundations

Rock

Nid Height

50
       
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.