Hammers No.1 Reservoir Report
Last Updated: December 13, 2025
Located in Garvin, Oklahoma, Hammers No.1 is a privately owned earth dam designed by the USDA NRCS and completed in 1977.
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Summary
The dam stands at a height of 25 feet and has a storage capacity of 51 acre-feet. It serves as a crucial structure in the management of the TR-ROCK CR river system, with a maximum discharge capacity of 590 cubic feet per second.
Managed by the Oklahoma Water Resources Board, Hammers No.1 is classified as a low hazard potential dam with a very high risk assessment rating. Despite its condition being labeled as "Not Rated," the dam undergoes inspection every 5 years to ensure its structural integrity and compliance with state regulations. With a controlled spillway and one outlet valve, the dam plays a vital role in flood control and water resource management for the surrounding area.
For water resource and climate enthusiasts, Hammers No.1 represents a significant piece of infrastructure in the Tulsa District's dam network. Its presence not only aids in water storage and flood prevention but also highlights the collaborative efforts between private owners and government agencies in ensuring the safety and sustainability of water resources in Oklahoma.
Year Completed |
1977 |
Dam Length |
630 |
Dam Height |
25 |
River Or Stream |
TR-ROCK CR |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Nid Storage |
51 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Washita River Near Pauls Valley
|
327cfs |
Walnut Creek At Purcell
|
28cfs |
Rock Creek At Sulphur
|
8cfs |
Canadian River At Purcell
|
201cfs |
North Criner Creek Near Criner
|
1cfs |
Washita River At Alex
|
236cfs |
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.
Hammers No.1