Big Rock Ranch Lake Dam Reservoir Report
Last Updated: December 5, 2025
Big Rock Ranch Lake Dam, located in Henderson, Texas, is a privately owned Rockfill dam with a height of 20.4 feet and a length of 940 feet.
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Summary
The dam has a storage capacity of 220 acre-feet and is situated on Mill Creek. While the dam does not have a spillway, it is equipped with one outlet gate to control water flow.
Despite being rated as having a high risk potential, the dam has not been inspected since July 2007. It is not regulated by the state and has not been assessed for its condition. The dam serves a primary purpose of 'Other', and its design includes a Buttress core type on an unlisted/unknown foundation.
Water resource and climate enthusiasts may find Big Rock Ranch Lake Dam an interesting case study due to its unique design elements and lack of recent inspections. As the dam is privately owned and not regulated by the state, there may be potential for further research on the management and maintenance practices of such structures in the face of changing climate conditions.
Dam Length |
940 |
Dam Height |
20.4 |
River Or Stream |
MILL CREEK |
Primary Dam Type |
Rockfill |
Surface Area |
27 |
Drainage Area |
2.3 |
Nid Storage |
220 |
Outlet Gates |
None - 1 |
Hazard Potential |
Not Available |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Cedar Ck Nr Kemp
|
15cfs |
Trinity Rv At Trinidad
|
2210cfs |
Trinity Rv At W Cedar Creek Pkwy Nr Dosser
|
2000cfs |
Kings Ck At Sh 34 Nr Kaufman
|
15cfs |
Trinity Rv At Hwy 287 Nr Cayuga
|
1890cfs |
Trinity Rv Nr Rosser
|
1750cfs |
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 Rock Ranch Lake Dam