Mystic Dike, located in Fishtail, Montana, is a privately owned earth dam with a primary purpose of hydroelectric power generation.
Wind
Humidity
Completed in 1927, this dam stands at a height of 17 feet and has a hydraulic height of 15.5 feet, serving as a key structure on West Rosebud Creek. With a storage capacity of 21,000 acre-feet and a normal storage level of 20,800 acre-feet, Mystic Dike covers a surface area of 446 acres and drains a 52-square mile watershed.
Managed by the Federal Energy Regulatory Commission, Mystic Dike has a high hazard potential due to its location and design. Despite being a privately owned structure, it is not regulated or inspected by the state of Montana. The dam's spillway, with a width of 145 feet, is uncontrolled, and its maximum discharge capacity is 5,000 cubic feet per second. The risk assessment for Mystic Dike is moderate, with a DSAC rating of 3, reflecting the need for ongoing risk management measures to ensure the safety and integrity of the dam.
Year Completed |
1927 |
Dam Length |
145 |
Dam Height |
17 |
River Or Stream |
West Rosebud Creek |
Primary Dam Type |
Earth |
Surface Area |
446 |
Hydraulic Height |
15.5 |
Drainage Area |
52 |
Nid Storage |
21000 |
Structural Height |
21 |
Hazard Potential |
High |
Nid Height |
21 |
| Location | Reservations | Toilets |
|---|---|---|
Emerald Lake Campground
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East Rosebud Campground
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Jimmy Joe Campground
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Woodbine Campground
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Woodbine
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Absaroka-Beartooth Wilderness Boundary To Headwaters, Sec. 29, T7S, R15E
Custer Forest Boundary, Sec. 1, T7S, S16E To Absaroka-Beartooth Wilderness Boundary
Absaroka-Beartooth Wilderness Boundary To Headwaters, Sec. 9, T9S, R14E
Absaroka-Beartooth Wilderness Boundary To Headwaters, Sec. 25, T8S, R17E