Alkali (Nid) Reservoir Report
Nearby: Carl Hansen Grass Creek 727 (Nid)
Last Updated: December 7, 2025
Alkali (Nid) is a federal-owned water resource located in Lyman, South Dakota, near the Missouri River.
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Summary
This earth dam, completed in 1938, serves multiple purposes including fire protection, stock watering, and maintaining a small fish pond. With a height of 16 feet and a storage capacity of 75 acre-feet, Alkali (Nid) plays a crucial role in managing water resources for the surrounding area.
Despite its low hazard potential, Alkali (Nid) has a moderate risk assessment level, indicating a need for ongoing monitoring and maintenance. The dam, which has not been inspected since 2006, is under the jurisdiction of the Forest Service and lacks detailed condition assessments. Emergency action plans and risk management measures are not currently in place, highlighting the importance of implementing safety protocols to mitigate potential threats and ensure the long-term stability of this essential water infrastructure.
As a vital component of the local ecosystem, Alkali (Nid) provides valuable water resources for wildlife and agricultural activities. With its strategic location near the Missouri River and Dry Draw, this dam serves as a vital source of water for the surrounding community. As water resource and climate enthusiasts, it is imperative to advocate for regular inspections, risk assessments, and emergency preparedness measures to safeguard Alkali (Nid) and ensure its continued functionality for future generations.
Year Completed |
1938 |
Dam Length |
420 |
Dam Height |
16 |
River Or Stream |
DRY DRAW |
Primary Dam Type |
Earth |
Hydraulic Height |
16 |
Drainage Area |
1 |
Nid Storage |
75 |
Structural Height |
16 |
Hazard Potential |
Low |
Nid Height |
16 |
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.
Alkali (Nid)