Non Potable Reservoir Dam 1 Reservoir Report

Last Updated: December 4, 2025

Non Potable Reservoir Dam 1, located in Colorado Springs, is a federal-owned structure designed by SKIDMORE, OWINGS, AND MERRILL with a primary purpose of flood risk reduction.


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Summary

Completed in 1961, this earth dam stands at a height of 50 feet with a hydraulic height of 41 feet, offering a maximum storage capacity of 95 acre-feet. Its spillway, with a width of 23 feet, is uncontrolled, allowing for a maximum discharge of 820 cubic feet per second.

Managed by the US Air Force, Non Potable Reservoir Dam 1 is regulated by the Department of Water Resources, with inspection and enforcement measures in place to ensure its safety and functionality. The dam's hazard potential is classified as significant, with a moderate risk assessment rating. While its condition assessment is currently unavailable, emergency action plans have been prepared and updated to meet guidelines, ensuring the safety of surrounding areas in case of a potential breach.

The dam's location on Lehman Run in El Paso County, Colorado, underscores its vital role in flood risk reduction and irrigation. With a surface area of 5.8 acres and a drainage area of 5 square miles, Non Potable Reservoir Dam 1 plays a crucial role in water resource management within the region, highlighting the intersection of infrastructure, climate resilience, and environmental stewardship.

Year Completed

1961

Dam Length

1100

Dam Height

50

River Or Stream

LEHMAN RUN

Primary Dam Type

Earth

Surface Area

5.8

Hydraulic Height

41

Drainage Area

5

Nid Storage

95

Outlet Gates

None, Uncontrolled

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

50
       
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.