Todd Lake Dam Reservoir Report
Last Updated: December 26, 2025
Todd Lake Dam, located in Bradford, New Hampshire, is a concrete buttress dam completed in 1858 primarily for recreational purposes.
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Summary
With a height of 16.5 feet and a length of 211 feet, the dam controls Ring Brook, offering a serene 198-acre surface area for water enthusiasts to enjoy. Despite its age, Todd Lake Dam has a significant storage capacity of 1,347 acre-feet, with a normal storage level of 336 acre-feet.
Although the dam's hazard potential is deemed significant and its condition assessment poor, it is inspected every four years by the NHDES DAM BUREAU to ensure compliance and safety. The spillway, with a width of 54 feet, is uncontrolled, allowing for the natural flow of water. The risk assessment for Todd Lake Dam is moderate, indicating the need for ongoing monitoring and management measures to mitigate potential risks. Additionally, the dam is regulated and permitted by the state, enforcing strict guidelines for its operation and maintenance. For water resource and climate enthusiasts, Todd Lake Dam serves as a historical landmark with valuable recreational opportunities in the picturesque Merrimack County of New Hampshire.
Year Completed |
1858 |
Dam Length |
211 |
Dam Height |
16.5 |
River Or Stream |
RING BROOK |
Primary Dam Type |
Concrete |
Surface Area |
198 |
Drainage Area |
18.7 |
Nid Storage |
1347 |
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.
Todd Lake Dam
Massasecum Lake boat launch