Mcmillen No. 2 Reservoir Report
Nearby: Mcmillen No. 3 Hawk Springs
Last Updated: December 5, 2025
Mcmillen No.
°F
°F
mph
Wind
%
Humidity
Summary
2, located in Goshen, Wyoming, near MORRILL, NEB, is a privately owned irrigation dam on DRY CREEK. Constructed in 1955, this Earth-type dam stands at 19 feet tall with a hydraulic height of 14 feet and a length of 969 feet. With a storage capacity of 202 acre-feet, the dam serves the primary purpose of irrigation, providing vital water resources to the surrounding area.
Despite its low hazard potential, Mcmillen No. 2 is currently in poor condition, as assessed during the last inspection in February 2018. The dam is regulated by the Wyoming State Engineer's Office and is subject to regular inspection, permitting, and enforcement. It is equipped with an uncontrolled spillway and a single valve for outlet gates. While the risk assessment for this dam is moderate, there are no specific risk management measures or emergency action plans in place as of now.
Water resource and climate enthusiasts will find Mcmillen No. 2 an intriguing case study, highlighting the importance of maintaining and monitoring aging infrastructure for sustainable water management. The dam's location in a dry region underscores the crucial role it plays in supporting agricultural activities through irrigation. With its historical significance and current condition, Mcmillen No. 2 presents an opportunity for stakeholders to collaborate on ensuring the continued safety and functionality of this essential water resource infrastructure.
Year Completed |
1955 |
Dam Length |
969 |
Dam Height |
19 |
River Or Stream |
DRY CREEK |
Primary Dam Type |
Earth |
Surface Area |
24 |
Hydraulic Height |
14 |
Nid Storage |
202 |
Structural Height |
19 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
19 |
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. 2