Morrison No. 2 Reservoir Report
Nearby: Miller No. 2 Hugh Mcdonald
Last Updated: December 5, 2025
Morrison No.
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Summary
2 is a privately owned earth dam located in Chugwater, Wyoming along the North Chugwater Creek. Built in 1975 by designer John M. Hill, this dam serves primarily for irrigation purposes, with additional functions for fire protection, stock, and small fish pond management. Standing at a height of 32 feet with a hydraulic height of 27 feet, this dam has a storage capacity of 129 acre-feet and covers a surface area of 16 acres.
Despite its low hazard potential, Morrison No. 2 is currently in poor condition according to a 2021 assessment. The dam features an uncontrolled spillway with a width of 80 feet and two valve outlet gates. Inspected every 5 years, the last assessment was in June 2021. While the risk assessment categorizes the dam as moderate, there are no specified risk management measures in place. The dam is located in a picturesque area with a drainage area of 0 but plays a crucial role in the local irrigation system.
Water resource and climate enthusiasts will find Morrison No. 2 an interesting subject for study due to its historical significance and its impact on the surrounding agricultural landscape. With its unique design features and the challenges it faces in terms of maintenance and risk management, this dam presents a fascinating case study for those interested in the intersection of water infrastructure and environmental sustainability in the region of Platte, Wyoming.
Year Completed |
1975 |
Dam Length |
595 |
Dam Height |
32 |
River Or Stream |
NORTH CHUGWATER CREEK |
Primary Dam Type |
Earth |
Surface Area |
16 |
Hydraulic Height |
27 |
Nid Storage |
129 |
Structural Height |
32 |
Outlet Gates |
Valve - 2 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
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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.
Morrison No. 2