Upper Lake Los Manzanos Dam Reservoir Report
Last Updated: December 25, 2025
Located in Kerr, Texas, the Upper Lake Los Manzanos Dam stands as a testament to human ingenuity and engineering prowess.
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Summary
Completed in 1964, this buttress dam serves primarily for irrigation purposes, with a storage capacity of 50 acre-feet and a maximum discharge capacity of 0 cubic feet per second. The dam spans 250 feet in length and reaches a height of 12 feet, harnessing the waters of Johnson Creek for agricultural use in the region.
Despite being privately owned and not regulated by the state, the dam presents a moderate risk level according to the data, with an uncontrolled spillway and four outlet gates. The condition of the dam is currently not rated, with the last inspection dating back to 2009. With a surface area of 7 acres and normal storage of 37 acre-feet, the Upper Lake Los Manzanos Dam offers not only vital irrigation resources but also recreational opportunities for the surrounding community.
As climate change continues to impact water resources and availability, the importance of maintaining and monitoring dams like Upper Lake Los Manzanos becomes increasingly evident. With its strategic location and historical significance, this dam serves as a critical infrastructure for water management in the region, highlighting the intersection between human development and natural ecosystems in the face of a changing climate.
Year Completed |
1964 |
Dam Length |
250 |
Dam Height |
12 |
River Or Stream |
JOHNSON CREEK |
Primary Dam Type |
Buttress |
Surface Area |
7 |
Hydraulic Height |
12 |
Nid Storage |
50 |
Structural Height |
12 |
Outlet Gates |
Uncontrolled - 4 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
12 |
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.
Upper Lake Los Manzanos Dam