Hoseck Detention No.1 Reservoir Report

Last Updated: December 5, 2025

Hoseck Detention No.1, also known as Loyal Hoseck Detention, is a private earth dam located in Winona, Minnesota, designed by the USDA NRCS and completed in 1978.


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Summary

The primary purpose of this dam is flood risk reduction, specifically for the Cedar Creek Offstream. Standing at a structural height of 36 feet and a length of 302 feet, this dam has a maximum storage capacity of 24 acre-feet and a normal storage capacity of 9 acre-feet, serving a drainage area of 0.47 square miles.

With a low hazard potential and a moderate risk assessment rating, Hoseck Detention No.1 is crucial in mitigating flood risks in the area. The dam features an uncontrolled spillway type with a width of 30 feet and outlet gates that are also uncontrolled. While the dam has not been rated for condition assessment, its strategic location and design contribute to its effectiveness in managing floodwaters and protecting the surrounding community. As an integral component of flood risk reduction efforts in the region, Hoseck Detention No.1 plays a vital role in safeguarding against potential water-related disasters.

Year Completed

1978

Dam Length

302

Dam Height

35

River Or Stream

CEDAR CREEK OFFSTREAM

Primary Dam Type

Earth

Surface Area

1

Hydraulic Height

35

Drainage Area

0.47

Nid Storage

24

Structural Height

36

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Soil

Nid Height

36
       
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.