Lone Star #2 Reservoir Report

Last Updated: December 5, 2025

Lone Star #2, also known as Middle Reservoir, is a privately owned irrigation dam located in Delta, Colorado.


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Summary

Completed in 1914, this earth dam stands at a height of 7 feet with a structural height of 14 feet, providing a storage capacity of 101 acre-feet for water from Alkali Creek-TR. With a low hazard potential and satisfactory condition assessment, this dam plays a crucial role in supporting agricultural activities in the region.

Managed by the Colorado Department of Water Resources, Lone Star #2 undergoes regular inspections and meets state regulatory standards for operation and maintenance. The dam features an uncontrolled spillway and outlet gates for water release, ensuring effective water management during periods of high discharge. Despite its age, the dam continues to serve its primary purpose of irrigation while posing a moderate risk in terms of potential hazards.

Situated in a picturesque landscape, Lone Star #2 is not only a functional irrigation structure but also a historical landmark that has stood the test of time. With its stone core and soil foundation, this dam remains a testament to early 20th-century engineering and water resource management practices. As water resource and climate enthusiasts explore the role of dams in sustainable water usage, Lone Star #2 stands as a reminder of the importance of maintaining and monitoring aging infrastructure for the benefit of future generations.

Year Completed

1914

Dam Length

1600

Dam Height

7

River Or Stream

ALKALI CREEK-TR

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

7

Nid Storage

101

Structural Height

14

Outlet Gates

Uncontrolled, Valve

Hazard Potential

Low

Foundations

Soil

Nid Height

14
       
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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.