Allen No.1 Reservoir Report
Nearby: Allen No.2 Oknoname 049004
Last Updated: December 16, 2025
Allen No.1, located in Garvin, Oklahoma, is a privately owned earth dam designed by USDA NRCS in 1977 for the purpose of water resource management along TR-OWL CREEK.
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Summary
This dam stands at a height of 25 feet with a length of 360 feet, providing a maximum storage capacity of 50 acre-feet. Although its hazard potential is rated as low and its condition assessment is not rated, the risk assessment for Allen No.1 is classified as very high, signaling the need for vigilant monitoring and maintenance.
Despite its low hazard potential, Allen No.1 is subject to state regulation, permitting, inspection, and enforcement by the Oklahoma Water Resources Board. The dam features a controlled spillway and a single valve outlet gate, ensuring proper water flow and management. In the event of an emergency, however, the presence of an Emergency Action Plan (EAP) and updated contact information for emergency responders are crucial aspects that appear to be lacking, highlighting potential areas for improvement to ensure the safety and resilience of the structure.
With a risk management measures and a risk characterization summary currently unspecified, there is room for enhancement in mitigating the identified very high risk associated with Allen No.1. As a significant component of the local water infrastructure, it is essential for stakeholders and regulators to prioritize the implementation of comprehensive risk management strategies and emergency preparedness measures to safeguard the surrounding community and ecosystems from potential hazards and ensure the continued functionality of this essential water resource facility.
Year Completed |
1977 |
Dam Length |
360 |
Dam Height |
25 |
River Or Stream |
TR-OWL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
50 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Allen No.1