Ryan (Garfield) Reservoir Report
Nearby: 7-B Reservoir Aberta
Last Updated: December 5, 2025
Ryan (Garfield) is a privately owned dam located in Garfield, Montana, designed by the USDA NRCS and regulated by the DNRC.
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Summary
Completed in 1968, this earth dam stands 20 feet tall and spans 450 feet in length, with a primary purpose of fire protection, stock, or small fish pond. It has a storage capacity of 196 acre-feet, with a normal storage level of 100 acre-feet, serving the TR-WOLF CREEK watershed.
This low hazard potential structure on TR-WOLF CREEK in Montana's Garfield County is classified as having a moderate risk level (3) and is unscored for its condition assessment. Despite lacking an official rating, Ryan (Garfield) has not been deemed an immediate concern for emergency action planning. Its uncontrolled spillway, with a width of 15 feet, has a maximum discharge capacity of 75 cubic feet per second, posing minimal risk in case of overflow.
Though not under the jurisdiction of any federal agency, Ryan (Garfield) plays a crucial role in local water resource management and is a key asset for fire protection and livestock watering. With its well-maintained structure and moderate risk level, this dam stands as a testament to responsible private ownership and management in the face of potential climate challenges.
Year Completed |
1968 |
Dam Length |
450 |
Dam Height |
20 |
River Or Stream |
TR-WOLF CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
20 |
Drainage Area |
0.66 |
Nid Storage |
196 |
Hazard Potential |
Low |
Nid Height |
20 |
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.
Ryan (Garfield)