John Graves Dam No 4 Reservoir Report
Last Updated: December 5, 2025
John Graves Dam No 4, located in Mills, Texas, was completed in 1974 for the primary purpose of irrigation.
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Summary
This private earth dam spans 130 feet in length and stands at a height of 20 feet, with a storage capacity of 75 acre-feet. While it serves various purposes such as fire protection, stock, and recreation, its main function remains irrigation for the surrounding area.
Despite being owned privately, the dam is subject to state permitting, inspection, and enforcement. It is situated on the TR-HOG BRANCH river/stream and falls under the jurisdiction of the Fort Worth District. With no spillway and a hazard potential deemed "Not Available," the dam's condition is yet to be rated. Nevertheless, its risk assessment indicates a high level of risk, signaling the need for continued monitoring and potential risk management measures to ensure its safety and functionality for water resource and climate enthusiasts who appreciate the vital role dams play in water management.
Year Completed |
1974 |
Dam Length |
130 |
Dam Height |
20 |
River Or Stream |
TR-HOG BRANCH |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Nid Storage |
75 |
Structural Height |
20 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Pecan Bayou Nr Mullin
|
2cfs |
San Saba Rv At San Saba
|
140cfs |
Colorado Rv Nr San Saba
|
211cfs |
Leon Rv Nr Hasse
|
2cfs |
Copperas Ck At Fm 2247 Nr Comanche
|
2cfs |
Pecan Bayou Nr Cross Cut
|
436cfs |
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.
John Graves Dam No 4