Mcpherson Reservoir Report
Nearby: Goose Pond Daly
Last Updated: December 14, 2025
Mcpherson is a private irrigation dam located in Natrona, Wyoming, with a primary purpose of providing water for irrigation.
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Summary
Built in 1923, this earth dam stands at a height of 20 feet and has a hydraulic height of 15 feet. It spans 510 feet in length and has a storage capacity of 168 acre-feet, with a normal storage level of 113 acre-feet. Despite its age, the dam is in fair condition with a low hazard potential, making it a relatively safe structure for water resource management.
Managed by the Wyoming State Engineer's Office, Mcpherson Draw TR Casper Cr serves as a vital water resource for the area. The dam features an uncontrolled spillway with a width of 100 feet and an outlet gate for water control. Regular inspections are conducted, with the last assessment taking place in September 2017, revealing a fair condition assessment. The risk assessment for the dam is moderate, indicating a level of 3 out of 5 in terms of potential hazards.
In the event of an emergency, the dam has protocols in place, although specific details such as the Emergency Action Plan (EAP) preparation status and risk management measures are not specified in the data. With Liz Cheney as the Congressional Representative for the area, Mcpherson continues to play a crucial role in water management for irrigation purposes, highlighting the importance of sustainable water resource practices in the region.
Year Completed |
1923 |
Dam Length |
510 |
Dam Height |
20 |
River Or Stream |
MCPHERSON DRAW TR CASPER CR |
Primary Dam Type |
Earth |
Surface Area |
11 |
Hydraulic Height |
15 |
Nid Storage |
168 |
Structural Height |
20 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
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.
Mcpherson