Langhorst Pond Reservoir Report

Last Updated: December 5, 2025

Langhorst Pond, located in Moose Lake, Minnesota, is a privately owned earth dam built in 1967 by the USDA NRCS for purposes beyond flood control.


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Summary

The dam, standing at a height of 11 feet and stretching 261 feet in length, serves as a water resource for the area, with a storage capacity of 367 acre-feet and a normal storage level of 105 acre-feet. The pond covers an area of 18 acres and has a drainage area of 2.7 square miles, with a maximum discharge capability of 150 cubic feet per second.

Managed by the MNDNR EWR, Langhorst Pond is classified as a low-hazard structure with satisfactory condition assessment as of September 2017. The dam features an uncontrolled spillway and outlet gates, with regular inspections conducted every 8 years to ensure its safety and functionality. The risk assessment for the pond is moderate, indicating a moderate level of potential risk associated with the structure.

Climate and water resource enthusiasts can appreciate Langhorst Pond for its role in providing water storage and management in the region. With its strategic location along the Portage River-TR and its low-hazard potential, the pond serves as a valuable asset for the community, highlighting the importance of sustainable water resource management practices in mitigating the impacts of climate change and ensuring water security for future generations.

Year Completed

1967

Dam Length

261

Dam Height

9

River Or Stream

PORTAGE RIVER-TR

Primary Dam Type

Earth

Surface Area

18

Drainage Area

2.7

Nid Storage

367

Structural Height

11

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

11
       
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.