Little Moreau #2 Reservoir Report
Nearby: Little Moreau #1 Little Moreau #3
Last Updated: December 13, 2025
Located in Dewey County, South Dakota, Little Moreau #2 is a state-owned earth dam that was completed in 1960.
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Summary
Standing at a height of 42 feet with a length of 300 feet, this dam has a storage capacity of 168 acre-feet, providing essential water resources for the surrounding area. The dam regulates the flow of the Tributary Little Moreau River and has a low hazard potential, making it a crucial infrastructure for managing water resources in the region.
With the State Department of Agriculture and Natural Resources (DANR) as the regulatory agency, Little Moreau #2 undergoes regular inspections every three years to ensure its structural integrity and safety. Despite not being rated for its condition assessment, the dam serves as a vital asset for water management in the area. With a maximum discharge capacity of 425 cubic feet per second, the dam plays a key role in flood control and water supply for agricultural and environmental needs.
As an integral part of water resource management in South Dakota, Little Moreau #2 stands as a testament to the state's commitment to maintaining and regulating its water infrastructure. With its low hazard potential and strategic location on the Tributary Little Moreau River, this dam serves as a critical component in ensuring water security for the region, highlighting the importance of sustainable water resource management in the face of changing climate conditions.
Year Completed |
1960 |
Dam Length |
300 |
Dam Height |
42 |
River Or Stream |
TRIB. LITTLE MOREAU RIVER |
Primary Dam Type |
Earth |
Hydraulic Height |
42 |
Nid Storage |
168 |
Hazard Potential |
Low |
Nid Height |
42 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Moreau R Near Whitehorse Sd
|
35cfs |
Grand R At Little Eagle Sd
|
47cfs |
Oak Cr Near Wakpala Sd
|
10cfs |
Cedar Creek Nr Raleigh
|
20cfs |
Moreau R Near Faith Sd
|
14cfs |
Cannonball River Nr Raleigh
|
40cfs |
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.
Little Moreau #2