Pm Johnston #1 Reservoir Report
Last Updated: December 6, 2025
Pm Johnston #1, also known as Johnston S Lake, is a private fish and wildlife pond located in Pickens County, Alabama.
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Summary
Constructed in 1975 by the USDA NRCS, this Earth-type dam stands at 30 feet tall and stretches 1200 feet in length. With a storage capacity of 947 acre-feet and a surface area of 100 acres, this reservoir serves as a habitat for fish and wildlife while also offering recreational opportunities.
Situated on TR-SENECA CREEK in the Mobile District, Pm Johnston #1 has a low hazard potential and a moderate risk assessment rating. Its uncontrolled spillway, 60 feet wide, can handle discharge rates of up to 1500 cubic feet per second. While the dam's condition is not currently rated, it is important to note that there are no state regulations or inspections in place for this structure.
Despite its private ownership and lack of state jurisdiction, Pm Johnston #1 plays a crucial role in supporting local ecosystems and providing recreational benefits to the community. As water resource and climate enthusiasts, understanding the infrastructure and management of such dams is essential for ensuring the safety and sustainability of our water resources.
Year Completed |
1975 |
Dam Length |
1200 |
Dam Height |
30 |
River Or Stream |
TR-SENECA CREEK |
Primary Dam Type |
Earth |
Surface Area |
100 |
Drainage Area |
2.66 |
Nid Storage |
947 |
Hazard Potential |
Low |
Nid Height |
30 |
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.
Pm Johnston #1