Lammi Scs Reservoir Report

Last Updated: December 5, 2025

Lammi SCS, located in Knife River, Minnesota, is a privately owned dam designed by the USDA NRCS and regulated by the Minnesota Department of Natural Resources.


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Summary

Completed in 1972, this Earth-type dam stands at a height of 14.4 feet and has a length of 505 feet, with a storage capacity of 60 acre-feet. The dam serves various purposes and is primarily used for flood control and water resource management.

Despite being classified as having a low hazard potential and being in satisfactory condition as of the last inspection in 2016, Lammi SCS still poses a moderate risk that requires attention. The dam's uncontrolled spillway and outlet gates present potential challenges that need to be addressed to ensure the safety and reliability of the structure. With a drainage area of 2 square miles and a maximum discharge of 46 cubic feet per second, the dam plays a crucial role in managing water flow in the Knife River-TR watershed.

Given its significance in the region's water infrastructure, ongoing monitoring and maintenance of Lammi SCS are essential to mitigate risks and ensure its continued effectiveness in water resource management. Climate enthusiasts and water resource professionals alike would find interest in the unique design and operational aspects of this dam that contribute to the sustainable management of water resources in Lake County, Minnesota.

Year Completed

1972

Dam Length

505

Dam Height

14.4

River Or Stream

KNIFE RIVER-TR

Primary Dam Type

Earth

Drainage Area

2

Nid Storage

60

Structural Height

15

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

15
       
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.