Sd Noname 21 Reservoir Report
Nearby: Sd Noname 127 Sd Noname 129
Last Updated: December 5, 2025
Sd Noname 21 is a privately owned dam located in Haakon, South Dakota, along the TRIB-GRINDSTONE CREEK.
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Summary
Built in 1970 by the Natural Resources Conservation Service, this Earth-type dam stands at 15 feet in height and spans a length of 435 feet. With a storage capacity of 150 acre-feet, the dam serves the primary purpose of water resource management, with a maximum discharge rate of 1000 cubic feet per second. Despite its low hazard potential, the dam's condition has not been rated, highlighting the importance of regular inspections and maintenance to ensure its safety and functionality.
Managed by the South Dakota Department of Environment and Natural Resources, Sd Noname 21 is subject to state regulation, permitting, inspection, and enforcement. The dam falls under the jurisdiction of the DENR and is monitored for compliance with safety standards to protect the surrounding community and environment. While the dam has not been assessed for its emergency action plan preparedness or risk management measures, its location in a rural area with limited impact potential suggests a lower level of risk compared to larger, more heavily populated areas.
With Dusty Johnson (R) as the Congressional Representative for the district, Sd Noname 21 plays a crucial role in the local water infrastructure by providing storage and flood control benefits. The dam's presence contributes to the overall water resource management efforts in South Dakota, highlighting the importance of maintaining and monitoring such structures to ensure their continued effectiveness and safety in the face of changing climate conditions.
Year Completed |
1970 |
Dam Length |
435 |
Dam Height |
15 |
River Or Stream |
TRIB-GRINDSTONE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
15 |
Nid Storage |
150 |
Hazard Potential |
Low |
Nid Height |
15 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Sd Noname 21