Johnson Lake Dam Reservoir Report
Nearby: Palazzo Lake Dam Forest Lake Dam
Last Updated: December 17, 2025
Johnson Lake Dam, located in Chain of Rocks, Missouri, is a privately owned earth dam primarily used for recreation.
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Summary
Completed in 1965, the dam stands at a height of 32 feet and has a storage capacity of 120 acre-feet, with a normal storage level of 70 acre-feet. The dam is situated on TR Indian Camp Creek, with a drainage area of 180 square miles.
With a high hazard potential, Johnson Lake Dam has not been rated for its condition and lacks an Emergency Action Plan (EAP) or updated inundation maps. Despite these shortcomings, the dam continues to serve its purpose for recreational activities and is a popular spot for water resource and climate enthusiasts to visit. The dam's buttress core design and unlisted/unknown foundation further add to its allure for engineering and infrastructure enthusiasts.
While Johnson Lake Dam may pose risks due to its hazard potential and lack of certain safety measures, its historical significance as a recreational structure in the Missouri landscape cannot be overlooked. As water resource and climate enthusiasts explore the area, they can appreciate the engineering and design of the dam while advocating for necessary updates to ensure its continued safety and functionality.
Year Completed |
1965 |
Dam Height |
32 |
River Or Stream |
TR INDIAN CAMP CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Drainage Area |
180 |
Nid Storage |
120 |
Structural Height |
32 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
32 |
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 Lake Dam