Dorr Woolen Sewage Lagoon Dam Reservoir Report
Nearby: Sugar River Ii Sugar River I
Last Updated: December 14, 2025
The Dorr Woolen Sewage Lagoon Dam in Newport, New Hampshire, is a significant Earth dam completed in 1986 with a primary purpose designated as "Other." The dam has a height of 20 feet and a length of 4380 feet, creating a reservoir with a storage capacity of 400 acre-feet.
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Summary
Situated within Sullivan County, the dam is owned and regulated by the local government, with oversight from the New Hampshire Department of Environmental Services Dam Bureau.
Despite its fair condition assessment as of September 2017, the Dorr Woolen Sewage Lagoon Dam poses a significant hazard potential, with a high risk rating of 2. With no spillway and a drainage area of only 0.01 square miles, this dam may be vulnerable to overtopping during extreme weather events. The dam lacks outlet gates and locks, further adding to its potential vulnerabilities in emergency situations.
For water resource and climate enthusiasts, the Dorr Woolen Sewage Lagoon Dam serves as a focal point for understanding the complexities of dam safety and management. With its unique design features and high-risk profile, this dam underscores the importance of regular inspections, risk assessments, and emergency preparedness measures to ensure the safety and resilience of our water infrastructure in the face of changing climate conditions.
Year Completed |
1986 |
Dam Length |
4380 |
Dam Height |
20 |
River Or Stream |
NA |
Primary Dam Type |
Earth |
Surface Area |
40 |
Drainage Area |
0.01 |
Nid Storage |
400 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
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.
Dorr Woolen Sewage Lagoon Dam
Perkins Pond boat launch