Jennie Lake Flowage Reservoir Report

Last Updated: December 5, 2025

Jennie Lake Flowage, located in Hoffman, Minnesota, is a state-regulated Earth dam with a primary purpose of serving as a Fish and Wildlife Pond.


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Summary

Completed in 1978, this structure stands at a height of 12 feet and spans a length of 175 feet. With a storage capacity of 50 acre-feet and a drainage area of 9.4 square miles, this flowage offers a habitat for various aquatic species while also providing recreational opportunities for the local community.

Managed by the Minnesota Department of Natural Resources, this low-hazard dam has been deemed to be in satisfactory condition as of the last inspection in 2012. With its location on the Chippewa River and its close proximity to numerous bodies of water, Jennie Lake Flowage plays a crucial role in the local ecosystem and contributes to the overall water resource management efforts in the region. Water resource and climate enthusiasts will appreciate the ecological significance of this structure and its impact on the surrounding environment.

Despite its low hazard potential, the dam at Jennie Lake Flowage is subject to periodic inspections, with a frequency of every 8 years. The structure's emergency action plan and risk assessment measures are currently unspecified, indicating a potential area for improvement in the future. Overall, this flowage stands as a testament to the importance of sustainable water management practices and serves as a valuable resource for both wildlife and the community at large.

Year Completed

1978

Dam Length

175

Dam Height

9

River Or Stream

CHIPPEWA RIVER-TR

Primary Dam Type

Earth

Surface Area

4

Drainage Area

9.4

Nid Storage

50

Structural Height

12

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

12
       
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.