Crooked Creek R-2 Reservoir Report

Last Updated: December 5, 2025

Crooked Creek R-2, also known as Lake Shamrock, is a local government-owned dam in Freeburg, Minnesota, designed by USDA NRCS in 1966 for flood risk reduction along Crooked Creek.


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Summary

The earth dam stands at a height of 48 feet and has a length of 535 feet, with a storage capacity of 314 acre-feet and a normal storage of 112 acre-feet. The dam's spillway is uncontrolled, with a width of 35 feet, and has a significant hazard potential but is currently in satisfactory condition as of the last assessment in 2016.

This dam plays a critical role in managing flood risk in the area, with a moderate risk assessment rating of 3. The Minnesota Department of Natural Resources regulates and inspects the dam, ensuring that it meets state permitting and enforcement requirements. Although the dam has not been modified in recent years, it undergoes inspections every four years to ensure its continued safety and effectiveness in protecting the surrounding community from potential flooding events. The dam's location in Houston County, Minnesota, makes it a key asset in water resource management and climate resilience efforts in the region.

Year Completed

1966

Dam Length

535

Dam Height

48

River Or Stream

CROOKED CREEK-TR

Primary Dam Type

Earth

Surface Area

6

Drainage Area

5

Nid Storage

314

Structural Height

52

Outlet Gates

Uncontrolled

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

52
       
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.