Herrick Lake Reservoir Report
Nearby: Lake Berry Dam Waterbnot Ratedy Dam
Last Updated: December 13, 2025
Herrick Lake in Gregory, South Dakota is a state-regulated water resource with a dam completed in 1937.
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Summary
This dam, primarily an Earth type structure, stands at a height of 20 feet and has a length of 1000 feet. With a normal storage capacity of 150 acre-feet and a maximum storage of 255 acre-feet, this reservoir plays a crucial role in managing water flow from the TR-PONCA CK river or stream. The dam also has a low hazard potential and has not been rated for its condition as of the last inspection in May 2017.
This scenic lake serves as a vital water source and recreational area for the surrounding community, offering opportunities for fishing, boating, and wildlife observation. Despite its age, Herrick Lake continues to be a reliable water resource, reflecting the importance of proper maintenance and regulation. The dam is under the jurisdiction of the South Dakota Department of Agriculture and Natural Resources (DANR), with regular inspections and enforcement ensuring the safety and integrity of the structure.
For water resource and climate enthusiasts, Herrick Lake presents a fascinating case study in the management of a man-made reservoir in a rural setting. Its history dating back to the 1930s and its ongoing role in water regulation highlight the intersection of human intervention and natural ecosystems. As efforts to address climate change intensify, understanding the role of dams like Herrick Lake in water conservation and management becomes increasingly crucial for sustainable resource utilization and environmental stewardship.
Year Completed |
1937 |
Dam Length |
1000 |
Dam Height |
20 |
River Or Stream |
TR-PONCA CK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
1 |
Nid Storage |
255 |
Hazard Potential |
Low |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Platte Creek Near Platte
|
3cfs |
Niobrara River At Mariaville
|
1650cfs |
Keya Paha R At Wewela Sd
|
54cfs |
Long Pine Creek Near Riverview
|
191cfs |
Keya Paha R Near Keyapaha Sd
|
33cfs |
White R Near Oacoma Sd
|
105cfs |
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.
Herrick Lake