Q-P Reservoir Report

Last Updated: December 13, 2025

Q-P, also known as Quealy-Peterson, is a privately owned Earth dam located in Cokeville, Wyoming, along Birch Creek.


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Summary

Completed in 1914, this irrigation structure stands at 26 feet tall and has a storage capacity of 139 acre-feet. Despite its age, Q-P is regulated and inspected by the Wyoming State Engineer's Office, ensuring its functionality and safety for agricultural water needs in the region.

With a spillway width of 10 feet and a low hazard potential, Q-P presents a moderate risk, rated at 3 on the risk assessment scale. The dam's condition is assessed as poor, indicating a need for maintenance and potential improvements to its infrastructure. Although it has a valve outlet gate for water control, the dam lacks drainage area and maximum discharge capacity, highlighting areas for potential enhancement to optimize its operational efficiency.

As a key component of the irrigation system in the area, Q-P plays a crucial role in water resource management and agricultural productivity. With proper maintenance and risk management measures, this historic dam can continue to support the needs of the community while adapting to the changing climate and water resource challenges in the region.

Year Completed

1914

Dam Length

328

Dam Height

26

River Or Stream

BIRCH CREEK

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

21

Nid Storage

139

Structural Height

26

Outlet Gates

Valve - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

26
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.