Quincy Reservoir Report

Last Updated: December 5, 2025

Quincy, a local government-owned dam located in Aurora, Colorado, plays a vital role in water supply and recreation in the area.


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Summary

Built in 1974, this earth dam stands at a height of 70 feet and has a maximum storage capacity of 4560 acre-feet. With a surface area of 155 acres and a drainage area of 4 square miles, Quincy Dam helps regulate the flow of the West Toll Gate Creek and has a maximum discharge capacity of 27000 cubic feet per second.

Despite its age, Quincy Dam maintains a satisfactory condition assessment and is inspected regularly to ensure its structural integrity. With a high hazard potential due to its location and purpose, Quincy Dam is deemed to have a moderate risk level (3). The dam features an uncontrolled spillway and stands at a structural height of 73 feet, providing essential water supply and recreational opportunities while also posing potential risks that necessitate thorough risk management measures.

In the event of an emergency, the dam's Emergency Action Plan (EAP) is crucial for ensuring quick and effective responses. While specifics regarding the EAP's preparation and compliance with guidelines are not detailed in the data, the dam's last inspection in September 2020 deemed its condition as satisfactory. Quincy Dam serves as a critical infrastructure for the community, highlighting the importance of responsible management and maintenance to safeguard against potential risks and ensure the continued availability of water resources and recreational amenities for residents in the region.

Year Completed

1974

Dam Length

2432

Dam Height

70

River Or Stream

WEST TOLL GATE CREEK

Primary Dam Type

Earth

Surface Area

155

Hydraulic Height

70

Drainage Area

4

Nid Storage

4560

Structural Height

73

Hazard Potential

High

Nid Height

73
       
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.