Downs, Jack is an earth dam located in Dawson County, Montana, built in 1938. It carries a Low hazard potential classification.
Dam profile
NID height · 23 ft23 ft tall and 850 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 Downs, Jack
The primary purpose of Downs, Jack is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Daniel/betty Downs (private). It impounds the Timber Fork Sevenmile Creek near Glendive.
The dam stands 23 feet tall and stretches 850 feet across, has a maximum storage capacity of 266 acre-feet, and collects water from a drainage area of 18 square miles. Completed in 1938, 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.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Montana |
| County | Dawson |
| Nearest City | Glendive |
| River/Stream | Timber Fork Sevenmile Creek |
| Coordinates | 47.17510, -105.10610 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 850 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 266 acre-ft |
| Max Storage | 266 acre-ft |
| Normal Storage | 90 acre-ft |
| Drainage Area | 18 sq mi |
| Max Discharge | 550 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Daniel/betty Downs |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00932 |
| Federal ID | MT00932 |
| More Info | State Dam Safety Program |