Tonn #3 is an earth dam located in Custer County, Montana, built in 1958. It carries a Low hazard potential classification.
Dam profile
NID height · 18 ft18 ft tall and 250 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 Tonn #3
The primary purpose of Tonn #3 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 State of Montana, D.n.r.c., T.l.m.d. (state). It impounds the Tr-deer Creek near Miles City.
The dam stands 18 feet tall and stretches 250 feet across, and has a maximum storage capacity of 52 acre-feet. Completed in 1958, the structure is well into its service life at over 50 years 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 | Custer |
| Nearest City | Miles City |
| River/Stream | Tr-deer Creek |
| Coordinates | 46.01280, -105.50600 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 250 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 52 acre-ft |
| Max Storage | 52 acre-ft |
| Normal Storage | 26 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| 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 | MT01672 |
| Federal ID | MT01672 |
| More Info | State Dam Safety Program |