Oja No.2 Reservoir Report
Nearby: Oja No.1 Wilson No.2
Last Updated: December 6, 2025
Oja No.2, located in Harding, South Dakota, is a privately owned earth dam completed in 1949 with a primary purpose that remains unspecified.
°F
°F
mph
Wind
%
Humidity
Summary
Managed by the Natural Resources Conservation Service, this dam stands at a height of 13 feet and has a length of 560 feet, providing a storage capacity of 150 acre-feet. Situated on the TR-South Fork Grand River, Oja No.2 has a low hazard potential and is currently rated as "Not Rated" in terms of its condition assessment.
Despite lacking specific information on its primary purpose, Oja No.2 plays a vital role in water resource management in the region. With a normal storage capacity of 57 acre-feet and a maximum discharge of 750 cubic feet per second, this dam serves as a crucial infrastructure for regulating water flow and mitigating potential risks associated with flooding. Although the dam has not been inspected recently, it is under state jurisdiction and subject to regulatory oversight by the South Dakota Department of Environment and Natural Resources.
Given its strategic location and historical significance as a water management structure, Oja No.2 presents an intriguing case study for water resource and climate enthusiasts. With its unique design and operational characteristics, this dam exemplifies the complex interplay between human interventions in natural hydrological systems and the need for sustainable water resource management practices in the face of changing climatic conditions. As efforts to address climate change intensify, understanding the role of dams like Oja No.2 becomes increasingly important in ensuring the resilience and adaptability of water infrastructure systems to future challenges.
Year Completed |
1949 |
Dam Length |
560 |
Dam Height |
13 |
River Or Stream |
TR-SOUTH FORK GRAND RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
13 |
Nid Storage |
150 |
Hazard Potential |
Low |
Nid Height |
13 |
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.
Oja No.2