Crazy Sombreo is an earth dam located in Meagher County, Montana, built in 1950. It carries a Significant hazard potential classification.
Dam profile
NID height · 58 ft58 ft tall and 340 ft long, taller than 95% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Crazy Sombreo
The primary purpose of Crazy Sombreo is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by John C. Mackay General Partner (private). It impounds the Spring Creek near Lebo.
The dam stands 58 feet tall and stretches 340 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 205 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1950, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
At 58 feet, this dam is taller than 95% of all dams in the United States.
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Location
| State | Montana |
| County | Meagher |
| Nearest City | Lebo |
| River/Stream | Spring Creek |
| Coordinates | 46.28950, -110.38240 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 58 ft |
| Dam Height | 58 ft |
| Dam Length | 340 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 205 acre-ft |
| Max Storage | 205 acre-ft |
| Normal Storage | 163 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | John C. Mackay General Partner |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03737 |
| Federal ID | MT03737 |
| More Info | State Dam Safety Program |