Carding Mill Pond Dam Reservoir Report
Nearby: Grist Mill Pond Dam Hager Pond Dam
Last Updated: December 18, 2025
Carding Mill Pond Dam, located in Sudbury, Massachusetts, is a masonry dam built in 1930 for recreational purposes on the Hop Brook.
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Summary
With a height of 17 feet and a hydraulic height of 13 feet, this dam provides a storage capacity of 200 acre-feet and a surface area of 42 acres. Despite being classified as having a significant hazard potential, the dam is currently in fair condition as of the last inspection in October 2017.
Managed by the Department of Conservation and Recreation, the Carding Mill Pond Dam is regulated by the state of Massachusetts and undergoes regular inspections and enforcement to ensure public safety. Although it has an uncontrolled spillway type, the dam has not been modified in recent years and does not have an Emergency Action Plan in place. With a moderate risk assessment rating, the dam presents a moderate level of risk to the surrounding area, highlighting the importance of ongoing monitoring and maintenance to prevent any potential hazards.
Overall, Carding Mill Pond Dam serves as a vital recreational structure in Middlesex County, offering a picturesque setting for outdoor activities. While it holds historical significance as a part of the local landscape, its condition and risk assessment underscore the need for continued attention and management to ensure the safety and enjoyment of visitors to the area. With a dedicated team overseeing its operations and a commitment to regular inspections, the dam remains a valuable resource for water resource and climate enthusiasts in the region.
Year Completed |
1930 |
Dam Length |
450 |
Dam Height |
17 |
River Or Stream |
HOP BROOK |
Primary Dam Type |
Masonry |
Surface Area |
42 |
Hydraulic Height |
13 |
Drainage Area |
3.88 |
Nid Storage |
200 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
17 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Carding Mill Pond Dam
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