Dd No 121 Reservoir Report
Nearby: Detention Dam No 133 Frd No 1
Last Updated: December 13, 2025
Dd No 121, located in Jackson County, Kansas, is a local government-owned Earth dam designed by Miles Engineering & Surve for flood risk reduction along the Cross Creek-TR river.
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Summary
Standing at 30 feet tall and 100 feet long, this dam has a storage capacity of 296 acre-feet, with a normal storage level of 39.8 acre-feet and a drainage area of 0.99 square miles. The dam's spillway, which is uncontrolled, is 40 feet wide and can handle a maximum discharge of 1128 cubic feet per second.
Despite being classified as having a low hazard potential and not having a condition assessment rating, Dd No 121 presents a moderate risk level according to the data. The dam has not been inspected since April 2010, and it is not equipped with outlet gates or locks. The emergency action plan (EAP) status, risk management measures, and inundation maps for the dam are currently unknown, highlighting the need for updated assessments and preparations to ensure the safety and efficiency of this vital flood risk reduction structure in Kansas.
Dam Length |
100 |
Dam Height |
30 |
River Or Stream |
CROSS CREEK-TR |
Primary Dam Type |
Earth |
Surface Area |
8.5 |
Drainage Area |
0.99 |
Nid Storage |
296 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Soldier C Nr Delia
|
2cfs |
Kansas R Nr Belvue
|
1410cfs |
Mill C Nr Paxico
|
32cfs |
Vermillion C Nr Wamego
|
8cfs |
Kansas R At Wamego
|
1400cfs |
Soldier C Nr Topeka
|
2cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Dd No 121