P M Johnston Dam Number One Reservoir Report
Last Updated: December 6, 2025
P M Johnston Dam Number One, located in Pickens County, Alabama, is a privately owned earth dam constructed in 1975 for the primary purpose of recreation.
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Summary
The dam spans 1000 feet in length and has a hydraulic height of 27 feet, with a structural height of 30 feet. With a storage capacity of 1080 acre-feet, the dam serves as a low hazard potential structure along the TR-SENECA CREEK, managed by the Mobile District of the US Army Corps of Engineers.
Despite being privately owned, P M Johnston Dam Number One does not fall under state regulation, permitting, inspection, or enforcement. With a condition assessment of 'Not Rated' and a low hazard potential, the dam currently does not have an emergency action plan in place. However, the dam provides a valuable recreational resource for the community, offering opportunities for boating, fishing, and water sports in the surrounding area.
As a significant feature in Congressional District 07 of Alabama, P M Johnston Dam Number One is an important part of the local landscape, contributing both to the natural environment and to the recreational activities enjoyed by residents and visitors. With its relatively low hazard potential and focus on recreation, the dam stands as a testament to the intersection of water resource management and outdoor enjoyment in the region.
Year Completed |
1975 |
Dam Length |
1000 |
River Or Stream |
TR-SENECA CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
27 |
Nid Storage |
1080 |
Structural Height |
30 |
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.
P M Johnston Dam Number One