Terry Gss No.1 Reservoir Report
Last Updated: December 13, 2025
Terry Gss No.1 is a privately owned dam located in Elmore City, Oklahoma, along the TR-EAST ROCK CREEK river or stream.
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Summary
Built in 1978 by the USDA NRCS, this Earth dam stands at a height of 28 feet and has a storage capacity of 50 acre-feet. It serves a primary purpose of "Other" and is regulated by the Oklahoma Water Resources Board (OWRB).
Despite its low hazard potential, Terry Gss No.1 is classified as having a very high risk due to its location and design characteristics. The dam features a controlled spillway with a width of 1 foot and an outlet gate consisting of a single valve. Inspected every 5 years, the dam is currently in a "Not Rated" condition assessment status, with emergency action plans and risk management measures yet to be fully implemented.
With its rich history dating back to the late 1970s, Terry Gss No.1 offers a glimpse into the engineering and regulatory aspects of water resource management in Oklahoma. Its association with the Natural Resources Conservation Service and state permitting agencies highlights the collaborative efforts to ensure the safety and integrity of water infrastructure in the region. As climate change continues to impact water resources, understanding the operation and maintenance of dams like Terry Gss No.1 becomes increasingly important for climate and water resource enthusiasts alike.
Year Completed |
1978 |
Dam Length |
275 |
Dam Height |
28 |
River Or Stream |
TR-EAST ROCK CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
28 |
Nid Storage |
50 |
Structural Height |
28 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
28 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Washita River Near Pauls Valley
|
327cfs |
Walnut Creek At Purcell
|
28cfs |
North Criner Creek Near Criner
|
1cfs |
Canadian River At Purcell
|
201cfs |
Washita River At Alex
|
236cfs |
Rock Creek At Sulphur
|
8cfs |
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.
Terry Gss No.1