Frd No 21 Reservoir Report

Last Updated: December 12, 2025

Frd No 21, also known as Upper Black Vermillion WS Dam 21, is a local government-owned structure in Frankfort, Kansas, designed by USDA NRCS for flood risk reduction along Ackerman Creek.


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Summary

Completed in 1971, this earth dam stands at a height of 29 feet with a hydraulic height of 26 feet, serving a primary purpose of flood risk reduction. With a storage capacity of 136.41 acre-feet and a surface area of 4.49 acres, Frd No 21 plays a crucial role in managing water flow in the region.

Located in Marshall County, Kansas, Frd No 21 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. While the dam does not have outlet gates or associated structures, it features an uncontrolled spillway with a width of 40 feet. The risk assessment for Frd No 21 indicates a moderate level of risk, with measures for risk management yet to be specified. As an essential part of the local water resource infrastructure, this dam contributes to the overall water management system in the region, ensuring the safety and protection of nearby communities from potential flooding events.

Year Completed

1971

Dam Length

645

Dam Height

29

River Or Stream

ACKERMAN CREEK-TR

Primary Dam Type

Earth

Surface Area

4.49

Hydraulic Height

26

Drainage Area

0.27

Nid Storage

136.41

Structural Height

29

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

29
       
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.