Heinrichs Mj Reservoir Report
Last Updated: December 6, 2025
Heinrichs Mj, also known as Gss No.
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Summary
1, is a privately owned earth dam located in Washita County, Oklahoma. Constructed in 1983 by the USDA NRCS, this dam serves a primary purpose of "Other" and stands at a height of 29 feet with a length of 800 feet. It has a storage capacity of 50 acre-feet and covers a surface area of 5 acres, with a drainage area of 237 acres. The dam is regulated by the Oklahoma Water Resources Board and undergoes regular inspections to ensure its safety and compliance with state regulations.
Despite being classified as having a low hazard potential, Heinrichs Mj is deemed to have a very high risk based on a risk assessment rating of 1. However, its condition assessment is currently listed as "Not Rated," indicating a need for further evaluation. The dam features a controlled spillway and a single valve outlet gate for water release. Although it has not been modified in recent years, it is subject to a 5-year inspection frequency to monitor its structural integrity and overall performance. The dam falls under the jurisdiction of the Tulsa District of the US Army Corps of Engineers and is representative of the crucial role that private entities play in managing water resources and climate adaptation efforts.
Year Completed |
1983 |
Dam Length |
800 |
Dam Height |
29 |
River Or Stream |
TR-WASHITA RIV |
Primary Dam Type |
Earth |
Surface Area |
5 |
Hydraulic Height |
29 |
Drainage Area |
237 |
Nid Storage |
50 |
Structural Height |
29 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
29 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Cobb Creek Near Eakly
|
16cfs |
Lake Creek Near Eakly
|
4cfs |
Willow Creek Near Albert
|
2cfs |
Cobb Creek Near Fort Cobb
|
4cfs |
Washita River Near Clinton
|
32cfs |
Washita River At Anadarko
|
121cfs |
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.
Heinrichs Mj