Thebes Lake is an earth dam located in Rosebud County, Montana, built in 1913. It carries a Low hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 1,100 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Thebes Lake
Thebes Lake is a dam in Rosebud, Montana. The dam is owned by William Magelssen, Estate of (private). It impounds the Sun Coulee near Hammond.
The dam stands 16 feet tall and stretches 1,100 feet across, and has a maximum storage capacity of 94 acre-feet. Completed in 1913, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life.
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Location
| State | Montana |
| County | Rosebud |
| Nearest City | Hammond |
| River/Stream | Sun Coulee |
| Coordinates | 46.53800, -107.24390 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 1,100 ft |
| Year Completed | 1913 (113 years old) |
Storage & Hydraulics
| NID Storage | 94 acre-ft |
| Max Storage | 94 acre-ft |
| Normal Storage | 40 acre-ft |
Ownership & Safety
| Purpose | Other |
| Owner | William Magelssen, Estate of |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02424 |
| Federal ID | MT02424 |
| More Info | State Dam Safety Program |