Anderson #6 Reservoir Report

Last Updated: December 5, 2025

Anderson #6 is a local government-owned dam located in Grand Junction, Colorado, along the Kahnah Creek-TR.


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Summary

Completed in 1929, this earth dam serves primarily as a water supply source, with a storage capacity of 122 acre-feet and a maximum discharge of 3,454 cubic feet per second. The dam stands at a height of 18 feet, with a structural height of 23 feet and a length of 390 feet.

Despite being classified as having a low hazard potential, Anderson #6 is deemed to be in fair condition as of its last assessment in August 2017. The dam is subject to state regulation and inspection by the Colorado Department of Water Resources, ensuring its continued safety and operation. Emergency action plans are in place, though their adherence to guidelines and preparedness for potential risks remain unspecified.

Water resource and climate enthusiasts may find Anderson #6 an interesting site to study, given its historical significance and critical role in supplying water to the local community. With its low hazard potential and fair condition, ongoing monitoring and maintenance efforts are essential to ensure the dam's continued safety and reliability in the face of potential climate-related challenges.

Year Completed

1929

Dam Length

390

Dam Height

18

River Or Stream

KAHNAH CREEK-TR

Primary Dam Type

Earth

Surface Area

13

Hydraulic Height

18

Nid Storage

122

Structural Height

23

Outlet Gates

Slide (sluice gate), Uncontrolled

Hazard Potential

Low

Foundations

Soil

Nid Height

23
       
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.