Johnson Lake Dam Reservoir Report
Last Updated: December 6, 2025
Johnson Lake Dam, located in Bandera, Texas, is a privately owned structure built in 1961 for the primary purpose of recreation.
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Summary
The dam stands at a height of 37.8 feet and spans a length of 425 feet, creating a reservoir with a normal storage capacity of 82 acre-feet. Situated on Mickle Creek, the dam serves as a popular spot for outdoor enthusiasts to enjoy activities such as boating and fishing.
Despite not being state regulated, Johnson Lake Dam undergoes regular inspections and has been modified in the past for structural improvements. The dam features uncontrolled and valve outlet gates, with a spillway width of 50 feet to manage potential overflow. With a moderate hazard potential rating, the dam is deemed to pose a manageable risk to the surrounding area. Overall, Johnson Lake Dam stands as a testament to the importance of water resource management and the role of dams in providing recreational opportunities for communities.
Years Modified |
1980 - Other, 1980 - Structural |
Year Completed |
1961 |
Dam Length |
425 |
Dam Height |
37.8 |
River Or Stream |
MICKLE CREEK |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
37.8 |
Drainage Area |
1.2 |
Nid Storage |
159 |
Structural Height |
37.8 |
Outlet Gates |
Uncontrolled - 2, Valve - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
38 |
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