Johnstone Pond Dam Reservoir Report
Last Updated: December 5, 2025
Johnstone Pond Dam, nestled in Woodstock, Connecticut, is a private dam situated along the Muddy Brook.
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Summary
With a primary purpose of recreation, this earth dam stands at a height of 12 feet and spans 200 feet in length, providing a surface area of 9 acres for water enthusiasts to enjoy. Despite its moderate size, the dam holds significant hazard potential and is under state regulation, inspection, and enforcement by the Department of Energy and Environmental Protection (DEEP) in Connecticut.
The dam, owned by a private entity, offers a tranquil spot for outdoor activities in Windham County. Its condition assessment as of December 2020 was deemed satisfactory, but with a significant hazard potential, it requires regular inspections every five years. Although the dam lacks certain features like spillways or outlet gates, it remains a popular spot for visitors seeking recreational opportunities in the area. Johnstone Pond Dam serves as a reminder of the importance of responsible management and maintenance of water resources in the face of climate challenges.
Enthusiasts of water resources and climate will find Johnstone Pond Dam a fascinating case study in the intersection of human infrastructure and natural landscapes. As a privately owned recreational facility, the dam presents both opportunities for enjoyment and risks that need to be managed effectively. Its location along the Muddy Brook adds to its charm, while its significant hazard potential underscores the need for ongoing monitoring and maintenance to ensure the safety of visitors and the surrounding environment. With state regulation and oversight in place, Johnstone Pond Dam stands as a testament to the careful balance required to sustainably utilize and protect our water resources in the face of changing climate conditions.
Dam Length |
200 |
Dam Height |
12 |
River Or Stream |
MUDDY BROOK |
Primary Dam Type |
Earth |
Surface Area |
9 |
Drainage Area |
1.1 |
Hazard Potential |
Significant |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
French R At N Grosvenordale
|
188cfs |
Little River At Harrisville
|
85cfs |
Quinebaug R At West Thompson
|
276cfs |
Quinebaug River At Quinebaug
|
245cfs |
Quinebaug River At Putnam
|
616cfs |
French River At Webster
|
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.
Johnstone Pond Dam
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Webster Memorial Park
Quaddick State Park
Wawela Park
Douglas State Forest
Westville Lake Recreation Area