Anderson #11 Reservoir Report
Nearby: Anderson #12 Anderson #10
Last Updated: December 14, 2025
Anderson #11 is a private earth dam located in Harper, Oklahoma, along Traders Creek.
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Summary
Built in 1960 by the USDA NRCS, this dam serves multiple purposes including fire protection, stock watering, and small fish pond management. With a height of 31 feet and a storage capacity of 68 acre-feet, Anderson #11 covers a surface area of 3 acres and drains a watershed of 0.62 square miles.
Despite its low hazard potential, Anderson #11 has a moderate risk rating of 3 due to its uncontrolled spillway and lack of recent inspections. The dam is not currently regulated by the state and has not been assessed for its condition or emergency action plan preparedness. In the event of a breach, the dam's moderate risk status suggests the potential for moderate consequences downstream. Enthusiasts of water resources and climate conservation may find Anderson #11's risk profile and management measures to be of interest in understanding the challenges and vulnerabilities of small dams in rural areas like Woodward, Oklahoma.
Year Completed |
1960 |
Dam Length |
264 |
Dam Height |
31 |
River Or Stream |
TRADERS CREEK |
Surface Area |
3 |
Hydraulic Height |
31 |
Drainage Area |
0.62 |
Nid Storage |
68 |
Hazard Potential |
Low |
Nid Height |
31 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Canadian River At Woodward
|
67cfs |
Cimarron River Near Buffalo
|
78cfs |
Cimarron River Near Waynoka
|
110cfs |
Cimarron R Near Buttermilk
|
46cfs |
Bluff Creek Nr Buttermilk
|
40cfs |
North Canadian River Near Seiling
|
101cfs |
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.
Anderson #11