Summary
George H. Marshall is a private irrigation dam located in Arvada, Wyoming, along the Yoga Draw river. Constructed in 2007, this earth dam stands at a height of 37 feet, with a hydraulic height of 31 feet and a structural height of 46 feet. The dam provides a maximum storage capacity of 95 acre-feet and a normal storage of 64 acre-feet, covering a surface area of 6.83 acres in Johnson County.
Managed under state jurisdiction with regulatory oversight from the State Engineer's Office, Enl. George H. Marshall has a low hazard potential and fair condition assessment. The dam features an uncontrolled spillway with a width of 12 feet and an outlet gate consisting of a single valve. With a moderate risk assessment rating, the dam underwent its last inspection in April 2018, with an inspection frequency of every 5 years. Despite its age, the dam continues to serve its primary purpose of irrigation effectively, showcasing the importance of water resource management in the region.
Year Completed |
2007 |
Dam Length |
220 |
Dam Height |
37 |
River Or Stream |
YOGA DRAW |
Primary Dam Type |
Earth |
Surface Area |
6.83 |
Hydraulic Height |
31 |
Drainage Area |
0.19 |
Nid Storage |
95 |
Structural Height |
46 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
46 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Clear Creek Near Buffalo
|
18cfs |
Wild Horse Creek Near Arvada
|
0cfs |
Powder River At Arvada
|
180cfs |
Powder River At Sussex
|
144cfs |
Rock Creek Near Buffalo
|
70cfs |
Piney Creek At Kearny
|
113cfs |
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.
Enl. George H. Marshall