Mcmillen No. 3 Reservoir Report
Nearby: Mcmillen No. 2 Hawk Springs
Last Updated: December 5, 2025
Mcmillen No.
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Summary
3 is a privately owned Earth dam located in Goshen County, Wyoming, specifically in the city of MORRILL, NEB. Built in 1957, this dam on DRY CREEK serves the primary purpose of irrigation, with a storage capacity of 174 acre-feet and a maximum height of 14 feet. The dam has a fair condition assessment as of the last inspection in February 2018, with a low hazard potential and moderate risk assessment.
Despite being a relatively small dam, Mcmillen No. 3 plays a crucial role in water resource management in the region. With a surface area of 16 acres and a spillway width of 150 feet, this structure helps to control water flow and provide irrigation for agricultural purposes. It is regulated by the State of Wyoming and undergoes regular inspections to ensure its safety and functionality.
Located within the Congressional District 00 of Wyoming, Mcmillen No. 3 is a key component of the local water infrastructure. While it may not have the same scale as larger dams, its contribution to water supply and management in the area is significant. As climate change continues to impact water resources, structures like Mcmillen No. 3 will play an increasingly vital role in ensuring sustainable water use for agriculture and other purposes.
Year Completed |
1957 |
Dam Length |
700 |
Dam Height |
14 |
River Or Stream |
DRY CREEK |
Primary Dam Type |
Earth |
Surface Area |
16 |
Hydraulic Height |
12 |
Nid Storage |
174 |
Structural Height |
14 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
14 |
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.
Mcmillen No. 3