Engdall Reservoir #1 Reservoir Report
Nearby: Engdahl #7 Engdahl #5
Last Updated: January 3, 2026
Engdall Reservoir #1, located in Garfield, Montana, was completed in 1937 by the USDA NRCS and serves multiple purposes including fire protection, stock watering, and as a small fish pond.
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Summary
The reservoir is a key water resource on Hell Creek, providing a vital source of water for the surrounding area. With a dam height of 30 feet and a storage capacity of 175 acre-feet, the reservoir plays a crucial role in maintaining water supply and supporting local ecosystems.
Managed by the Montana Department of Natural Resources and Conservation (DNRC), Engdall Reservoir #1 is regulated and inspected to ensure its safety and functionality. The reservoir has a low hazard potential and a moderate risk assessment level. It features an uncontrolled spillway with a width of 80 feet and a maximum discharge of 400 cubic feet per second. While the condition assessment is currently not rated, the reservoir continues to be a valuable asset for water management and conservation efforts in the region.
Engdall Reservoir #1, situated in Congressional District 00 of Montana, is a significant water infrastructure project that continues to contribute to the sustainable management of water resources in the area. With its historical significance and ongoing importance for fire protection, livestock watering, and ecological support, the reservoir exemplifies the intersection of water resource management and climate resilience. As enthusiasts in these fields, the reservoir's design, purpose, and regulatory oversight offer valuable insights into the challenges and opportunities associated with maintaining critical water infrastructure in a changing climate.
Year Completed |
1937 |
Dam Length |
400 |
Dam Height |
30 |
River Or Stream |
HELL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
25 |
Drainage Area |
6.56 |
Nid Storage |
175 |
Hazard Potential |
Low |
Nid Height |
30 |
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.
Engdall Reservoir #1