Ramsbottom Reservoir Report
Nearby: Purdy Smith No. 1
Last Updated: December 13, 2025
Ramsbottom, a private-owned water resource in Johnson, Wyoming, serves multiple purposes including fire protection, stock watering, and small fish pond irrigation.
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Summary
Completed in 1970, this earth dam stands at 30 feet high with a hydraulic height of 25 feet and a structural height of 34 feet. It holds a maximum storage capacity of 72 acre-feet, with a normal storage level of 35 acre-feet and a surface area of 7 acres.
Despite its low hazard potential, Ramsbottom is rated as having poor condition as of the last inspection in August 2019. The dam features an uncontrolled spillway with a width of 70 feet and one uncontrolled outlet gate. With a moderate risk assessment level of 3, there is a need for improved risk management measures to ensure the safety and integrity of this important water resource. Given its location in the Cottonwood Draw and its critical role in the local ecosystem, maintaining Ramsbottom is vital for the surrounding community and environment.
Year Completed |
1970 |
Dam Length |
250 |
Dam Height |
30 |
River Or Stream |
COTTONWOOD DRAW |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
25 |
Nid Storage |
72 |
Structural Height |
34 |
Outlet Gates |
Uncontrolled - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
34 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nf Powder River Below Pass Creek
|
50cfs |
Clear Creek Near Buffalo
|
30cfs |
North Fork Powder River Near Hazelton
|
3cfs |
Powder River At Sussex
|
144cfs |
Rock Creek Near Buffalo
|
70cfs |
Piney Creek At Kearny
|
113cfs |
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.
Ramsbottom