Ten Mile Lake Reservoir Report

Last Updated: December 5, 2025

Ten Mile Lake in Minnesota is a captivating example of a state-regulated dam with a primary purpose that falls under the category of "Other." Built in 1937, this Gravity dam stands at a height of 6.2 feet and has a hydraulic height of 3.8 feet, serving as a vital structure for regulating water flow and storage in the area.


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Summary

The dam has a Normal Storage capacity of 8,920 acre-feet and covers a surface area of 2,208 acres, making it a significant resource for the surrounding environment.

Located in Otter Tail County, Ten Mile Lake is situated near the Pomme de Terre River, providing essential water management functions for the region. With a low hazard potential and fair condition assessment, the dam has undergone regular inspections and has been found to meet regulatory guidelines. The surrounding area benefits from the moderate risk assessment rating of 3, indicating a level of risk that is manageable through appropriate risk management measures. Overall, Ten Mile Lake serves as a key component in the water resource infrastructure of Minnesota, contributing to the sustainability and resilience of the local ecosystem.

Year Completed

1937

Dam Length

60

Dam Height

6.2

River Or Stream

POMME DE TERRE RIVER

Primary Dam Type

Gravity

Surface Area

2208

Hydraulic Height

3.8

Drainage Area

140

Nid Storage

13380

Structural Height

7

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

7
       
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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.