Johnson Lake Dam Reservoir Report
Nearby: Johns Lake Dam (Shallow) Buckner Dam
Last Updated: December 21, 2025
Johnson Lake Dam, located in Pacific, Missouri, serves as a crucial structure for fish and wildlife conservation as well as recreation.
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Summary
Completed in 1970, this earth dam stands at 22 feet high and spans 460 feet in length, with a storage capacity of 69 acre-feet. The dam, situated on TR-Winch Creek, is primarily managed by a private entity and has a low hazard potential, making it a vital component of the local ecosystem.
Despite being non-federally regulated, Johnson Lake Dam plays a significant role in water resource management and flood control within the Franklin County area. With a moderate risk assessment rating, the dam ensures the safety and well-being of nearby residents while maintaining a balance between environmental conservation and recreational activities. While not currently rated for its condition, the dam continues to provide essential services to the community and remains a focal point for water resource and climate enthusiasts in the region.
As a point of interest for those passionate about water resources and climate dynamics, Johnson Lake Dam stands as a testament to the importance of sustainable infrastructure development. With its focus on fish and wildlife conservation, as well as recreation, the dam showcases the harmonious coexistence of human activities with natural ecosystems. By providing a safe and efficient means of water storage and management, Johnson Lake Dam exemplifies the intersection between environmental stewardship and community engagement in the context of water resource sustainability.
Year Completed |
1970 |
Dam Length |
460 |
Dam Height |
22 |
River Or Stream |
TR-WINCH CREEK |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
22 |
Drainage Area |
150 |
Nid Storage |
69 |
Structural Height |
22 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Meramec River At Pacific
|
557cfs |
Big River At Byrnesville
|
176cfs |
Meramec River Near Eureka
|
858cfs |
Bourbeuse River At Union
|
73cfs |
Bonhomme Creek Near Ellisville
|
0cfs |
Kiefer Creek Near Ballwin
|
1cfs |
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 Lake Dam