Lonnie Heldermon Gssi Reservoir Report
Nearby: Danny Wright Fisher Canyon
Last Updated: December 15, 2025
Located in Hinton, Oklahoma, Lonnie Heldermon Gssi is a privately owned Earth dam on the South Canadian River, designed by the USDA NRCS and completed in 1995.
°F
°F
mph
Wind
%
Humidity
Summary
With a height of 45 feet and a length of 500 feet, this dam serves multiple purposes and has a storage capacity of 61 acre-feet. It is regulated by the OWRB and undergoes regular inspections to ensure its structural integrity and safety.
Despite its low hazard potential, Lonnie Heldermon Gssi is classified as having a very high risk due to its location and the potential impact of a breach. The dam is equipped with a controlled spillway and a single valve outlet gate for water release. While its condition assessment is currently listed as "Not Rated," the dam has not experienced any major modifications since its completion.
For water resource and climate enthusiasts, Lonnie Heldermon Gssi presents an intriguing case study in dam management and risk assessment. As part of the Tulsa District in Oklahoma, this dam highlights the importance of ongoing monitoring and maintenance to ensure the safety of surrounding communities and the long-term sustainability of water resources in the region.
Year Completed |
1995 |
Dam Length |
500 |
Dam Height |
45 |
River Or Stream |
SOUTH CANADIAN |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
45 |
Drainage Area |
461 |
Nid Storage |
61 |
Structural Height |
45 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
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.
Lonnie Heldermon Gssi