Glowmill Reservoir Report
Nearby: Garrelts No. 1 Sinnard
Last Updated: December 15, 2025
Glowmill, located in Goshen County, Wyoming, is a private irrigation dam on Box Elder Creek that was completed in 1976.
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Summary
Designed by J.H. Coffman, this Earth-type dam stands at a height of 17 feet and has a storage capacity of 1561 acre-feet. With a significant hazard potential and a poor condition assessment as of the last inspection in May 2017, Glowmill poses moderate risk and is in need of maintenance and upgrades to ensure its safety and functionality.
Despite being a privately owned structure, Glowmill is regulated by the state of Wyoming, with permitting, inspection, and enforcement responsibilities falling under the State Engineer's Office. The dam's purpose is primarily for irrigation, serving the surrounding agricultural community by providing water storage and distribution. The spillway, with a width of 200 feet, is uncontrolled, and the dam features other controlled outlet gates to manage water release.
As an essential component of the water resource infrastructure in the region, Glowmill plays a crucial role in supporting agricultural activities in the area. Climate and water resource enthusiasts would find this dam noteworthy for its design, purpose, and the need for ongoing maintenance to ensure its continued safe operation. With its location on Box Elder Creek and its significant storage capacity, Glowmill represents a vital piece of Wyoming's water management system that requires attention to ensure its long-term reliability and safety.
Year Completed |
1976 |
Dam Length |
1920 |
Dam Height |
17 |
River Or Stream |
BOX ELDER CREEK |
Primary Dam Type |
Earth |
Surface Area |
260 |
Hydraulic Height |
13 |
Drainage Area |
25.5 |
Nid Storage |
1561 |
Structural Height |
17 |
Outlet Gates |
Other Controlled - 2 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
17 |
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.
Glowmill