Pettegrew Dam Reservoir Report
Nearby: E.E Pettegrew Dam No.2 Felz Dam
Last Updated: December 6, 2025
Pettegrew Dam, located in Fall River, South Dakota, is a privately owned structure that serves as a vital resource for water management in the area.
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Summary
Built in 1910, this earth dam stands at a height of 10 feet and has a length of 750 feet, with a storage capacity of 140 acre-feet. Situated on the tributary of Horsehead Creek, the dam plays a crucial role in regulating water flow and ensuring sustainable water supply for the region.
Despite being classified as having a low hazard potential, Pettegrew Dam is subject to state regulation and inspection, with the South Dakota Department of Environment and Natural Resources (DENR) overseeing its permitting, inspection, and enforcement processes. This level of oversight ensures that the dam continues to meet safety standards and operate effectively. Additionally, the dam falls under the jurisdiction of the Omaha District of the US Army Corps of Engineers, highlighting its significance in the overall water resource management system in the region.
With its historical significance and continued relevance in water management, Pettegrew Dam stands as a testament to the importance of sustainable water infrastructure. As climate change impacts water resources worldwide, structures like Pettegrew Dam play a crucial role in adapting to changing conditions and ensuring the resilience of water supply systems. Through ongoing monitoring, maintenance, and regulation, Pettegrew Dam remains a key asset in safeguarding water resources for future generations.
Year Completed |
1910 |
Dam Length |
750 |
Dam Height |
10 |
River Or Stream |
TRIBUTARY HORSEHEAD CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
10 |
Nid Storage |
140 |
Hazard Potential |
Low |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Horsehead Cr At Oelrichs Sd
|
0cfs |
Hat Cr Near Edgemont Sd
|
0cfs |
Cheyenne R Below Angostura Dam Sd
|
2cfs |
White R Nr Ne-Sd State Line
|
10cfs |
Fall R At Hot Springs Sd
|
31cfs |
White R Near Oglala Sd
|
101cfs |
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.
Pettegrew Dam