Six Mile Creek Reservoir Report

Last Updated: December 5, 2025

Six Mile Creek, located in Cass County, Minnesota, is a federally owned Earth dam built in 1975 with a primary purpose listed as 'Other'.


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Summary

The dam has a height of 15 feet and a length of 90 feet, providing storage for up to 5500 acre-feet of water from the Sixmile Brook. With a drainage area of 14 square miles, the dam has a maximum discharge capacity of 770 cubic feet per second and a surface area of 1293 acres.

Despite being classified as having a low hazard potential and satisfactory condition assessment, Six Mile Creek poses a moderate risk due to its location and design. The dam is equipped with an uncontrolled spillway and has undergone regular inspections, with the last assessment conducted in 2009. While the dam meets guidelines for emergency action plans, there is currently no updated information available on the status of these preparedness measures.

Although Six Mile Creek may not be a high-risk structure, its presence and function play a crucial role in managing water resources and mitigating the impact of climate change in the region. As a key component of the local water infrastructure, it is essential to continue monitoring and maintaining the dam to ensure its effectiveness in safeguarding the surrounding community and environment against potential hazards.

Year Completed

1975

Dam Length

90

Dam Height

15

River Or Stream

SIXMILE BROOK

Primary Dam Type

Earth

Surface Area

1293

Drainage Area

14

Nid Storage

5500

Structural Height

20

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

20
       
Seasonal Comparison

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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.