Summary
2 is a privately owned earth dam located in Arvada, Wyoming, along the Arpan Draw river. Completed in 1973, this dam serves multiple purposes including fire protection, stock watering, and small fish pond maintenance. With a height of 22 feet and a length of 430 feet, Mary No. 2 has a storage capacity of 95 acre-feet and a surface area of 7 acres. Despite its low hazard potential and fair condition assessment, the dam is classified as having a moderate risk level (3), highlighting the importance of ongoing monitoring and maintenance.
Managed by the Wyoming State Engineer's Office, Mary No. 2 is subject to state regulation, permitting, inspection, and enforcement. The dam features an uncontrolled spillway with a width of 30 feet and one uncontrolled outlet gate. While the dam has not undergone any modifications in recent years, it is inspected every 5 years to ensure its structural integrity and safety. With its location in Johnson County, Wyoming, Mary No. 2 plays a crucial role in flood risk reduction in the area, demonstrating the essential role of dams in water resource management and climate resilience efforts.
Overall, Mary No. 2 stands as a vital infrastructure asset in Wyoming, providing essential services for fire protection, stock watering, and flood risk reduction. With its moderate risk level and fair condition assessment, ongoing monitoring and maintenance are crucial to ensure the safety and functionality of this earth dam. As water resource and climate enthusiasts, it is important to recognize the importance of dams like Mary No. 2 in managing water resources, protecting communities, and enhancing climate resilience in the face of changing environmental conditions.
Year Completed |
1973 |
Dam Length |
430 |
Dam Height |
22 |
River Or Stream |
ARPAN DRAW |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
16 |
Nid Storage |
95 |
Structural Height |
21 |
Outlet Gates |
Uncontrolled - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Powder River At Arvada
|
156cfs |
Wild Horse Creek Near Arvada
|
0cfs |
Clear Creek Near Buffalo
|
12cfs |
Piney Creek At Kearny
|
113cfs |
Rock Creek Near Buffalo
|
70cfs |
Clear Creek Near Arvada
|
256cfs |
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.
Mary No. 2