Johnston Lake Number 2 Dam Reservoir Report
Last Updated: December 5, 2025
Johnston Lake Number 2 Dam in Mississippi is a private-owned structure regulated by the state's Department of Environmental Quality.
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Summary
This earth dam with a buttress core stands at 8 feet tall and has a storage capacity of 56 acre-feet, mainly designated for recreational purposes. The dam's low hazard potential and moderate risk assessment make it a relatively safe structure, although its condition assessment is currently not rated.
Located in Pike County, Mississippi, the Johnston Lake Number 2 Dam is managed by private owners and falls under state jurisdiction for regulation, permitting, inspection, and enforcement. Despite its uncontrolled spillway type and lack of outlet gates, the dam's risk level remains moderate, with emergency preparedness measures not fully assessed. The surrounding area, with a drainage area and surface area unspecified, could benefit from further assessments and risk management measures to ensure the dam's safety and resilience in the face of potential climate challenges.
Dam Height |
8 |
Nid Storage |
56 |
Hazard Potential |
Low |
Nid Height |
8 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Tangipahoa River At Osyka
|
478cfs |
Bogue Chitto Nr Tylertown
|
578cfs |
Tickfaw River At Liverpool
|
44cfs |
Homochitto River At Eddiceton
|
168cfs |
Amite River Near Darlington
|
267cfs |
Pearl River Nr Monticello
|
2030cfs |
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.
Johnston Lake Number 2 Dam