Dd No Sp-9 Reservoir Report

Last Updated: December 5, 2025

Dd No Sp-9, located in Towanda, Kansas, along the Four Mile Creek, is a local government-owned dam designed by the USDA SCS and regulated by the KS Dept.


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Summary

of Agriculture. Completed in 1994, this earth dam serves the primary purpose of flood risk reduction, with additional functions for debris control. With a dam height of 24 feet and a length of 2930 feet, Dd No Sp-9 has a storage capacity of 1059.6 acre-feet, providing crucial protection to the surrounding area.

Despite its low hazard potential and moderate risk assessment, Dd No Sp-9 has not been rated for its condition assessment. This dam features an uncontrolled spillway with a width of 50 feet and no outlet gates. As a key structure in the flood risk reduction strategy for the region, Dd No Sp-9 plays a vital role in managing water resources and protecting the community from potential disasters. With its location in a high-risk flood zone, regular inspections and maintenance are essential to ensure the dam's continued effectiveness in safeguarding the area.

As water resource and climate enthusiasts, understanding the details and significance of structures like Dd No Sp-9 is crucial for promoting sustainable water management practices and adapting to the challenges of a changing climate. By staying informed about the design, operation, and regulatory oversight of dams like Dd No Sp-9, enthusiasts can contribute to the resilience of water infrastructure and the protection of communities in the face of increasing environmental risks.

Year Completed

1994

Dam Length

2930

Dam Height

24

River Or Stream

FOUR MILE CREEK

Primary Dam Type

Earth

Surface Area

21.9

Drainage Area

2.08

Nid Storage

1059.6

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

24
       
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.