Nw Pearson Reservoir Report
Nearby: Barber Creek 31-11-4876 Lower Morgan
Last Updated: December 9, 2025
Nw Pearson, located in Campbell, Wyoming, is a privately owned irrigation dam designed by Thomas Jaap and completed in 1970.
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Summary
The dam, measuring 43 feet in height and 458 feet in length, serves multiple purposes such as fire protection, stock, and small fish pond, in addition to irrigation. With a storage capacity of 114 acre-feet and a surface area of 6.8 acres, Nw Pearson plays a crucial role in water resource management in the region.
Maintained and regulated by the Wyoming State Engineer's Office and Department of Environmental Quality, Nw Pearson has a low hazard potential and fair condition assessment as of the last inspection in April 2021. The dam features an uncontrolled spillway with a width of 25 feet and an outlet gate consisting of a single valve. Despite its moderate risk assessment, Nw Pearson meets state permitting, inspection, and enforcement requirements, ensuring its continued safe operation for water users and the surrounding environment.
Situated along the West Pearson Draw river, Nw Pearson not only provides essential water resources for irrigation but also contributes to the overall water management infrastructure in the area. With its strategic location and functional design, Nw Pearson showcases the importance of sustainable water resource development and management in mitigating the impacts of climate change on water availability and quality.
Year Completed |
1970 |
Dam Length |
458 |
Dam Height |
43 |
River Or Stream |
WEST PREASON DRAW |
Primary Dam Type |
Earth |
Surface Area |
6.8 |
Hydraulic Height |
38 |
Drainage Area |
0.4 |
Nid Storage |
114 |
Structural Height |
48 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
48 |
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.
Nw Pearson