Dd No 204 Reservoir Report

Last Updated: December 5, 2025

Dd No 204, also known as Rock Creek Watershed Dam No 204, is a flood risk reduction structure located in Lyon County, Kansas.


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Summary

This earth dam has a height of 25 feet and a length of 775 feet, providing a storage capacity of 183.9 acre-feet and normal storage of 39.8 acre-feet. The dam is situated on Bluff Creek, within the Kansas City District, and is owned and operated by the local government in the city of Dunlap.

Managed by the USDA NRCS, Dd No 204 serves the primary purpose of flood risk reduction in the area, with a low hazard potential and a moderate risk assessment rating. While the dam has not been rated for its current condition, it has not undergone any recent modifications or inspections since April 2005. The spillway type for this structure is uncontrolled, with a width of 70 feet and a maximum discharge capacity of 1848 cubic feet per second.

Water resource and climate enthusiasts interested in the management and infrastructure of flood control systems will find Dd No 204 to be an intriguing case study. With its unique design features, location, and purpose, this dam provides valuable insight into the efforts to mitigate flood risks and protect communities in the region. As a critical piece of infrastructure in the Rock Creek watershed, Dd No 204 plays a vital role in safeguarding the area against potential flooding events, highlighting the importance of effective water resource management and climate resilience strategies.

Dam Length

775

Dam Height

25

River Or Stream

BLUFF CREEK-TR

Primary Dam Type

Earth

Surface Area

8.99

Hydraulic Height

25

Drainage Area

0.48

Nid Storage

183.9

Structural Height

28

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

28
       
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.