Engdahl #7 Reservoir Report
Nearby: Engdall Reservoir #1 Engdahl #5
Last Updated: January 11, 2026
Engdahl #7 is a privately owned earth dam located in Garfield, Montana, along the TR-HELL CREEK.
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Summary
Designed by the USDA NRCS and completed in 1940, this dam serves multiple purposes including fire protection, stock watering, and creating a small fish pond. With a dam height of 24 feet and a length of 300 feet, Engdahl #7 has a storage capacity of 57 acre-feet and a drainage area of 1.56 square miles.
Despite its low hazard potential and moderate risk assessment rating, Engdahl #7 is regulated, permitted, and inspected by the state of Montana, with the DNRC overseeing enforcement and regulation. The dam is equipped with an uncontrolled spillway, 100 feet wide, and can discharge up to 500 cubic feet per second. While the condition assessment is currently marked as "Not Rated," the dam meets state jurisdiction guidelines and is subject to regular inspections.
For water resource and climate enthusiasts, Engdahl #7 presents an interesting case study in dam infrastructure and management. As a vital resource for fire protection and irrigation in the region, this privately owned earth dam highlights the importance of proper regulation, inspection, and maintenance to ensure the safety and functionality of water storage structures. With its historical significance and role in supporting local ecosystems, Engdahl #7 serves as a valuable example of sustainable water management practices in Montana.
Year Completed |
1940 |
Dam Length |
300 |
Dam Height |
24 |
River Or Stream |
TR-HELL CREEK |
Primary Dam Type |
Earth |
Hydraulic Height |
24 |
Drainage Area |
1.56 |
Nid Storage |
57 |
Hazard Potential |
Low |
Nid Height |
24 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Nelson Creek Near Van Norman Mt
|
33cfs |
Musselshell River At Mosby Mt
|
240cfs |
Milk River At Nashua Mt
|
233cfs |
Milk River At Tampico Mt
|
123cfs |
Flatwillow Creek Near Mosby Mt
|
17cfs |
Beaver Cr Bl Guston Coulee Nr Saco Mt
|
67cfs |
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.
Engdahl #7