Dan Gray No. 3 Reservoir Report
Nearby: D. Booth No.3 C. Peterson No.1
Last Updated: December 13, 2025
Dan Gray No.
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Summary
3 is a privately-owned earth dam located in Dewey County, South Dakota, along the TR. Stove Creek. Built in 1955 by USDS NRCS, this dam stands at a height of 25 feet and spans 300 feet in length, with a storage capacity of 170 acre-feet. Despite its relatively low hazard potential, the dam is regulated and inspected by the South Dakota Department of Environment and Natural Resources, ensuring its safety and compliance with state regulations.
With a maximum discharge capacity of 1,080 cubic feet per second and an uncontrolled spillway width of 80 feet, Dan Gray No. 3 serves as a moderate risk (level 3) structure in terms of potential hazards. While its condition is currently not rated, the dam's risk management measures and emergency preparedness protocols are crucial aspects to consider for water resource and climate enthusiasts. As a key component of the local water management system, this dam plays a vital role in regulating water flow and storage in the region, highlighting the importance of ongoing monitoring and maintenance efforts to ensure its long-term reliability.
Year Completed |
1955 |
Dam Length |
300 |
Dam Height |
25 |
River Or Stream |
TR. STOVE CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Drainage Area |
1 |
Nid Storage |
170 |
Outlet Gates |
None |
Hazard Potential |
Low |
Nid Height |
25 |
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 |
Bad R Near Fort Pierre Sd
|
7cfs |
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.
Dan Gray No. 3