Johnson Creek Dam Reservoir Report
Last Updated: December 18, 2025
Johnson Creek Dam, located in Groveland, Massachusetts, was completed in 1913 and serves as a vital recreational resource for the community.
°F
°F
mph
Wind
%
Humidity
Summary
The dam, standing at 16 feet in height and 100 feet in length, holds a storage capacity of 220 acre-feet and covers a surface area of 16 acres. Situated on Johnson Creek, the dam is regulated by the Department of Conservation and Recreation, ensuring its safety and compliance with state standards.
With a significant hazard potential but a satisfactory condition assessment, Johnson Creek Dam is equipped with an uncontrolled spillway and has a drainage area of 5.3 square miles. The dam is inspected every five years to monitor its structural integrity and potential risks. While it poses a moderate risk, the dam's emergency action plan and risk management measures are currently unspecified, prompting further evaluation and preparedness to safeguard against any unforeseen emergencies. As a key structure in Essex County, Massachusetts, Johnson Creek Dam remains a focal point for water resource and climate enthusiasts seeking to understand the intersection of dam infrastructure and environmental conservation.
Year Completed |
1913 |
Dam Length |
100 |
Dam Height |
16 |
River Or Stream |
JOHNSON CREEK |
Primary Dam Type |
Concrete |
Surface Area |
16 |
Hydraulic Height |
16 |
Drainage Area |
5.3 |
Nid Storage |
220 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
16 |
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.
Johnson Creek Dam
West Main Street 206, Georgetown