Anna Reservoir Report
Nearby: Total Station Ring
Last Updated: December 13, 2025
Anna is a private earth dam located in Wyoming, specifically in Johnson County near Indian Creek Ranch.
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Summary
Built in 2007 for the primary purpose of irrigation, Anna stands at a structural height of 38 feet and has a storage capacity of 73 acre-feet. This dam on Kashmir Creek is regulated by the state and is subject to inspection, enforcement, and permitting by the Wyoming State Engineer's Office (SEO) and Department of Environmental Quality (DEQ).
With a low hazard potential and fair condition assessment, Anna poses a moderate risk according to a rating of 3. The dam has a spillway width of 30 feet and a maximum discharge capacity of 1436 cubic feet per second. It has one valve outlet gate and is designed to serve irrigation, fire protection, stock, and small fish pond purposes. Despite its relatively small size, Anna plays a crucial role in water resource management in the area and contributes to the sustainability of the surrounding ecosystem.
The last inspection of Anna took place in June 2017, with a scheduled inspection frequency of 5 years. The dam's emergency action plan status and risk management measures are not specified, but with its current condition and regulatory oversight, Anna continues to provide essential water storage and management services to the local community and ecosystem. For water resource and climate enthusiasts, Anna serves as a fascinating case study in sustainable water infrastructure development and management in the western United States.
Year Completed |
2007 |
Dam Length |
313 |
Dam Height |
30 |
River Or Stream |
KASHMIR CREEK |
Primary Dam Type |
Earth |
Surface Area |
3.74 |
Hydraulic Height |
23 |
Drainage Area |
0.25 |
Nid Storage |
73 |
Structural Height |
38 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Rock, Soil |
Nid Height |
38 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Clear Creek Near Buffalo
|
18cfs |
Powder River At Arvada
|
180cfs |
Wild Horse Creek Near Arvada
|
0cfs |
Powder River At Sussex
|
144cfs |
Rock Creek Near Buffalo
|
70cfs |
Nf Powder River Below Pass Creek
|
50cfs |
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.
Anna