Erwin #2 Reservoir Report
Nearby: Oknoname 059040 Oknoname 059042
Last Updated: December 20, 2025
Erwin #2 is a private earth dam located on Willow Creek in Harper County, Oklahoma.
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Summary
Constructed in 1968 by the USDA NRCS, this structure stands at 27 feet in height and spans 155 feet in length, with a storage capacity of 50 acre-feet and a surface area of 4 acres. While the dam has a low hazard potential, it is classified as having a moderate risk level (3) due to its condition assessment being marked as "Not Rated."
Despite being unregulated by the state, Erwin #2 serves as a vital water resource for the surrounding area, providing irrigation and flood control benefits to the local community. With its uncontrolled spillway and proximity to the city of Buffalo, this dam plays a crucial role in managing water flow along Willow Creek. Although the structure has not been inspected recently and lacks an Emergency Action Plan (EAP), its strategic location and design contribute to its importance in water resource management and climate resilience efforts in the region.
Year Completed |
1968 |
Dam Length |
155 |
Dam Height |
27 |
River Or Stream |
WILLOW CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
27 |
Drainage Area |
0.47 |
Nid Storage |
50 |
Hazard Potential |
Low |
Nid Height |
27 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Cimarron R Near Buttermilk
|
46cfs |
Bluff Creek Nr Buttermilk
|
41cfs |
Cimarron River Near Buffalo
|
73cfs |
Crooked C Nr Englewood
|
7cfs |
North Canadian River At Woodward
|
68cfs |
Cimarron River Near Forgan
|
19cfs |
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.
Erwin #2