Jelly Bean is an earth dam located in Fergus County, Montana, built in 1940. It carries a Low hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 800 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 Jelly Bean
The primary purpose of Jelly Bean is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by State of Montana, D.n.r.c., T.l.m.d. (state). It impounds the Tr-fords Creek near Mosby.
The dam stands 16 feet tall and stretches 800 feet across, has a maximum storage capacity of 97 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1940, the structure is well-established, with more than 75 years of service.
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 | Fergus |
| Nearest City | Mosby |
| River/Stream | Tr-fords Creek |
| Coordinates | 47.12560, -108.77620 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 800 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 97 acre-ft |
| Max Storage | 97 acre-ft |
| Normal Storage | 41 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 600 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | State of Montana, D.n.r.c., T.l.m.d. |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00158 |
| Federal ID | MT00158 |
| More Info | State Dam Safety Program |