Sanborn Lake Reservoir Report

Last Updated: December 5, 2025

Sanborn Lake in Le Sueur, Minnesota, is a state-regulated water resource managed by the Minnesota Department of Natural Resources (MNDNR EWR).


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Summary

The lake, designed by Ducks Unlimited, serves multiple purposes with a normal storage capacity of 761 acre-feet and a maximum storage capacity of 1668 acre-feet. With a surface area of 315 acres and a drainage area of 3.63 square miles, Sanborn Lake plays a crucial role in water management and conservation in the region.

This buttress-type dam, with a height of 10 feet and a hydraulic height of 7.5 feet, has a low hazard potential and has not been rated for its current condition. The dam has not been inspected recently, with an inspection frequency of 8 years. Although the risk assessment and management measures for the dam are not specified, the lake's importance in the local ecosystem and water supply highlight the need for continued monitoring and maintenance to ensure its long-term sustainability and safety.

Located in the St. Paul District, Sanborn Lake provides a serene environment for water and climate enthusiasts to appreciate the beauty and significance of this state-regulated water resource in Minnesota. With its diverse ecosystem and crucial role in water management, Sanborn Lake stands as a testament to the importance of preserving and protecting our natural resources for future generations.

Dam Height

10

Surface Area

315

Hydraulic Height

7.5

Drainage Area

3.63

Nid Storage

1668

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

10
       
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.