Big Lake Los Manzanos Dam Reservoir Report
Last Updated: December 25, 2025
Big Lake Los Manzanos Dam, located in Kerr, Texas, stands as a testament to the importance of water resource management in the region.
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Summary
Built in 1968 by Henningson Durham and Richardson, this private earth dam serves multiple purposes, including fire protection, stock, and small fish pond maintenance. Its strategic location on Johnson Creek ensures that it also supports recreation and water supply needs in the area.
With a height of 13 feet and a length of 300 feet, Big Lake Los Manzanos Dam boasts a storage capacity of 189 acre-feet, making it a vital resource for the community. The dam's uncontrolled spillway and multiple outlet gates ensure efficient water management and control during emergency situations. Despite being classified as having a moderate risk level, the dam has not been rated for its condition, highlighting the need for continued monitoring and maintenance to uphold safety standards.
As climate change impacts water resources, the significance of structures like Big Lake Los Manzanos Dam becomes increasingly clear. With its rich history and vital role in the local ecosystem, this dam serves as a beacon for water resource and climate enthusiasts alike, showcasing the intersection of human ingenuity and environmental stewardship in safeguarding our precious water supply.
Year Completed |
1968 |
Dam Length |
300 |
Dam Height |
13 |
River Or Stream |
JOHNSON CREEK |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
13 |
Nid Storage |
189 |
Structural Height |
13 |
Outlet Gates |
Uncontrolled - 3, Valve - 1 |
Hazard Potential |
Not Available |
Foundations |
Rock, Soil |
Nid Height |
13 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Johnson Ck Nr Ingram
|
13cfs |
Guadalupe Rv At Hunt
|
38cfs |
N Fk Guadalupe Rv Nr Hunt
|
33cfs |
Guadalupe Rv Abv Bear Ck At Kerrville
|
43cfs |
Guadalupe Rv At Kerrville
|
46cfs |
Guadalupe Rv Nr Center Point
|
48cfs |
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.
Big Lake Los Manzanos Dam