Schwartz Estate Pond Dam 6 Reservoir Report
Last Updated: December 21, 2025
Located in Spring Valley, New York, the Schwartz Estate Pond Dam 6 is an Earth-type dam primarily designed for flood risk reduction along the Mahwah River.
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Summary
With a height of 17.5 feet and a storage capacity of 30 acre-feet, this dam plays a crucial role in mitigating flood hazards in the area. Despite its significant hazard potential and poor condition assessment, the dam is regulated and inspected by the New York State Department of Environmental Conservation to ensure public safety.
The dam features an uncontrolled spillway with a width of 24 feet and a maximum discharge capacity of 972 cubic feet per second. Its normal storage capacity is 12 acre-feet, covering an area of 3 acres. While the dam's last inspection in November 2017 raised concerns about its condition, the emergency action plan was last revised in December 2020, highlighting ongoing efforts to manage potential risks associated with the structure. With a moderate risk rating and a history of state regulation and enforcement, Schwartz Estate Pond Dam 6 remains a key asset in protecting the surrounding communities from flooding events.
As water resource and climate enthusiasts continue to monitor the dam's condition and functionality, its role in flood risk reduction along the Mahwah River underscores the importance of maintaining and upgrading critical infrastructure to safeguard lives and property. With continued state oversight and enforcement, the Schwartz Estate Pond Dam 6 stands as a vital component in the region's resilience against natural disasters and underscores the need for ongoing risk management measures to ensure its long-term effectiveness.
Dam Height |
17.5 |
River Or Stream |
MAHWAH RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Nid Storage |
30 |
Hazard Potential |
Significant |
Nid Height |
18 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Mahwah River Near Suffern Ny
|
38cfs |
Ramapo River At Suffern Ny
|
434cfs |
Ramapo River At Ramapo Ny
|
375cfs |
Ramapo River Near Mahwah Nj
|
432cfs |
Saddle River At Upper Saddle River Nj
|
10cfs |
Pascack Brook At Park Ridge Nj
|
16cfs |
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.
Area Campgrounds
| Location | Reservations | Toilets |
|---|---|---|
Beaver Pond - Harriman State Park
|
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Beaver Pond Campsite
|
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Croton Point Park
|
Schwartz Estate Pond Dam 6
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Greenwood Lk At Awosting Nj
Ringwood-Ramapo Trail Ringwood