B-downs #8 is an earth dam located in Big Horn County, Montana, built in 1974. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 650 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 B-downs #8
The primary purpose of B-downs #8 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 R Downs (private). It impounds the Williams Coulee near Hardin.
The dam stands 20 feet tall and stretches 650 feet across, has a maximum storage capacity of 474 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1974, 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 | Big Horn |
| Nearest City | Hardin |
| River/Stream | Williams Coulee |
| Coordinates | 45.71797, -107.84922 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 650 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 474 acre-ft |
| Max Storage | 474 acre-ft |
| Normal Storage | 243 acre-ft |
| Drainage Area | 5 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | R Downs |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01854 |
| Federal ID | MT01854 |
| More Info | State Dam Safety Program |