Chapman A.B. Gss No.2 Reservoir Report
Last Updated: December 21, 2025
Chapman A.B.
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Summary
Gss No.2 is a privately owned dam located in Greer County, Oklahoma, with a primary purpose listed as "Other." The dam, completed in 1979, stands at a height of 15 feet and has a storage capacity of 65 acre-feet. It is situated on the Horse Branch river and is regulated by the Oklahoma Water Resources Board (OWRB).
Despite its low hazard potential, Chapman A.B. Gss No.2 is considered to have a very high risk level, with a risk assessment rating of 1. The dam has not been rated for its condition assessment, and the last inspection took place in November 2010. The emergency action plan (EAP) status and risk management measures are currently unknown, indicating a need for updated preparedness and monitoring.
Climate and water resource enthusiasts may find Chapman A.B. Gss No.2 intriguing due to its location in an area with a significant drainage area of 530 square miles and a maximum discharge capacity of 550 cubic feet per second. The dam's controlled spillway, earth core type, and stone foundation contribute to its structural integrity, though its risk level warrants further attention from regulatory agencies and owners to ensure the safety and stability of the dam in the face of potential climate-related challenges.
Year Completed |
1979 |
Dam Height |
15 |
River Or Stream |
HORSE BRANCH |
Primary Dam Type |
Earth |
Surface Area |
13 |
Hydraulic Height |
15 |
Drainage Area |
530 |
Nid Storage |
65 |
Structural Height |
15 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
15 |
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.
Chapman A.B. Gss No.2