Monument Lake Reservoir Report

Last Updated: December 4, 2025

Monument Lake, located in El Paso County, Colorado, is a picturesque reservoir with a rich history dating back to its completion in 1893.


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Summary

Managed by the local government, this earth dam structure serves multiple purposes including irrigation, recreation, and water supply for the surrounding area. With a maximum storage capacity of 922 acre-feet and a normal storage level of 305 acre-feet, Monument Lake covers a surface area of 31 acres and is fed by Monument Creek.

The dam stands at a height of 47 feet and has a hydraulic height of 34 feet, providing significant hazard potential due to its size and location. Despite this, the condition assessment conducted in May 2019 deemed the dam to be in satisfactory condition. Regular inspections are carried out every two years to ensure the safety and integrity of the structure. The spillway type is uncontrolled with a width of 130 feet, allowing for the controlled release of excess water in the event of flooding.

Monument Lake is not only a vital water resource for the local community but also a popular recreational spot for residents and visitors alike. With its stunning natural surroundings and historical significance, this reservoir is not only a symbol of sustainable water management but also a testament to the enduring relationship between humans and their environment in the face of changing climate patterns.

Year Completed

1893

Dam Length

851

Dam Height

47

River Or Stream

MONUMENT CREEK

Primary Dam Type

Earth

Surface Area

31

Hydraulic Height

34

Drainage Area

30

Nid Storage

922

Structural Height

47

Outlet Gates

Slide (sluice gate)

Hazard Potential

Significant

Foundations

Soil

Nid Height

47
       
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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.