Alfred Not Ratedban Reservoir Report
Nearby: Ehlers Dam William Smith
Last Updated: December 13, 2025
Alfred Not Ratedban is a privately owned dam located in Lyman, South Dakota, along the CEDARCREEK OFFSTREAM.
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Summary
Constructed in 1963 by the Natural Resources Conservation Service, this earth-type dam stands at a height of 25 feet with a total length of 1210 feet. The dam has a storage capacity of 119 acre-feet and a maximum discharge of 2550 cubic feet per second.
Despite being regulated by the South Dakota Department of Environment and Natural Resources, the condition of Alfred Not Ratedban is currently listed as "Not Rated" with a low hazard potential. While the dam has not been assessed for its overall condition, it remains under state jurisdiction with permitting, inspection, and enforcement measures in place. With a history of safe operation, Alfred Not Ratedban serves as an important water resource in the region, contributing to flood control and water storage for the surrounding area.
As a key infrastructure asset in South Dakota, Alfred Not Ratedban plays a crucial role in managing water resources and mitigating potential climate impacts. While its condition assessment is pending, the dam continues to provide valuable services to the community. With ongoing regulatory oversight and maintenance, Alfred Not Ratedban remains a vital component of the region's water management infrastructure.
Year Completed |
1963 |
Dam Length |
1210 |
Dam Height |
25 |
River Or Stream |
CEDARCREEK OFFSTREAM |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
119 |
Hazard Potential |
Low |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Bad R Near Fort Pierre Sd
|
7cfs |
White R Near Oacoma Sd
|
105cfs |
White River Near White River
|
42cfs |
Little White R Below White River Sd
|
141cfs |
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.
Alfred Not Ratedban