Ollie Stock Reservoir Report
Nearby: Busted Clutch Auzqui No. 1
Last Updated: December 5, 2025
Located in Powder River, Wyoming, Ollie Stock is a private earth dam completed in 1963 primarily used for fire protection, stock, or as a small fish pond.
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Summary
With a height of 25 feet and a hydraulic height of 20 feet, the dam has a normal storage capacity of 55 acre-feet and a maximum storage capacity of 91 acre-feet. Despite having a low hazard potential, the dam is categorized as having a fair condition assessment as of its last inspection in July 2017.
The dam is situated on the No. Three Draw river or stream, within the jurisdiction of the state and regulated by the Wyoming State Engineer's Office. With a spillway type of uncontrolled and a spillway width of 59 feet, Ollie Stock covers a surface area of 6 acres and has a drainage area of 0 acres. The risk assessment for the dam is moderate (3), indicating a level of risk management measures in place to mitigate potential hazards.
Ollie Stock, owned and operated by a private entity, is a vital resource for the local community in terms of fire protection and stock water supply. As water resource and climate enthusiasts, it is important to monitor the condition of this dam and ensure that proper maintenance and inspection protocols are followed to safeguard against any potential risks or emergencies that may arise in the future.
Year Completed |
1963 |
Dam Length |
341 |
Dam Height |
25 |
River Or Stream |
NO. THREE DRAW |
Primary Dam Type |
Earth |
Surface Area |
6 |
Hydraulic Height |
20 |
Nid Storage |
91 |
Structural Height |
25 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Powder River At Arvada
|
156cfs |
Wild Horse Creek Near Arvada
|
0cfs |
Clear Creek Near Arvada
|
256cfs |
Piney Creek At Kearny
|
113cfs |
Rock Creek Near Buffalo
|
70cfs |
Clear Creek Near Buffalo
|
12cfs |
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.
Ollie Stock