Basin #1 Reservoir Report

Last Updated: December 13, 2025

Basin #1 is a vital water resource located in Delta, Colorado, primarily serving the purpose of water supply for irrigation and other domestic uses.


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Summary

This earth dam structure, completed in 1949, stands at a height of 18 feet and has a storage capacity of 538 acre-feet, with a normal storage level of 258 acre-feet. Situated on Dirty George Creek, this basin covers a surface area of 56 acres and has a drainage area of 1 square mile.

Despite being classified as having a low hazard potential and a satisfactory condition assessment, Basin #1 poses a high risk level due to its location and other factors. The dam does not have a spillway, but is equipped with slide and uncontrolled outlet gates. The last inspection in August 2020 reported satisfactory conditions, and the dam is regulated, permitted, inspected, and enforced by the Colorado Department of Water Resources.

This basin, managed by the local government, remains a crucial water source in the region, ensuring water availability for agricultural and domestic needs. With its historical significance and strategic location, Basin #1 plays a crucial role in water resource management and climate resilience efforts in the area.

Year Completed

1949

Dam Length

650

Dam Height

18

River Or Stream

DIRTY GEORGE CREEK

Primary Dam Type

Earth

Surface Area

56

Hydraulic Height

16

Drainage Area

1

Nid Storage

538

Structural Height

20

Outlet Gates

Slide (sluice gate), Uncontrolled

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

20
       
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.