Sweet Carolyn is an earth dam located in Valley County, Montana, built in 1958. It carries a Significant hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 200 ft long, taller than 55% of U.S. dams with a recorded height. 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 Sweet Carolyn
The primary purpose of Sweet Carolyn is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Carolyn Muggli (private). It impounds the Tr-milk River near Glasgow.
The dam stands 26 feet tall and stretches 200 feet across, has a maximum storage capacity of 223 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1958, the structure is well into its service life at over 50 years old.
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.
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Location
| State | Montana |
| County | Valley |
| Nearest City | Glasgow |
| River/Stream | Tr-milk River |
| Coordinates | 48.24270, -106.66570 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 200 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 223 acre-ft |
| Max Storage | 223 acre-ft |
| Normal Storage | 118 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 1,500 cfs |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Carolyn Muggli |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03026 |
| Federal ID | MT03026 |
| More Info | State Dam Safety Program |