Cogan Pond Dam Reservoir Report
Last Updated: December 23, 2025
Cogan Pond Dam in Worcester, Massachusetts is a privately owned structure that serves primarily for recreational purposes.
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Summary
The dam is regulated by the Department of Conservation and Recreation in the state, with inspection and enforcement measures in place. Located on Cold Spring Brook in Sutton, the dam has a height of 25 feet and a hydraulic height of 16.5 feet, with a storage capacity of 30.1 acre-feet.
Despite its low hazard potential, the dam's condition assessment is poor, and it poses a very high risk, indicating the need for immediate attention and management measures. The last inspection conducted on the dam was in November 2007, with a frequency of every 10 years. While the dam does not have an Emergency Action Plan (EAP) in place, it is crucial for stakeholders to address the risk assessment and take necessary steps to ensure public safety and the integrity of the structure.
Dam Height |
25 |
River Or Stream |
COLD SPRING BROOK |
Primary Dam Type |
Other |
Hydraulic Height |
16.5 |
Drainage Area |
2.84 |
Nid Storage |
30.1 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Blackstone River
|
115cfs |
Blackstone River At Northbridge
|
1240cfs |
Quinsigamond River At North Grafton
|
34cfs |
French River Below Dam
|
3cfs |
West River Below West Hill Dam
|
1cfs |
Little River Near Oxford
|
4cfs |
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.
Cogan Pond Dam
Torrey Road 22, Sutton