Thunder Basin No 9 is an earth dam located in Weston County, Wyoming, built in 1937. It carries a Low hazard potential classification.
Dam profile
NID height · 21 ft21 ft tall and 420 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 Thunder Basin No 9
The primary purpose of Thunder Basin No 9 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 Usda Fs (federal). It impounds the Little Frog Creek near Edgemont, Sd.
The dam stands 21 feet tall and stretches 420 feet across, creates a reservoir covering 6 acres, has a maximum storage capacity of 53 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1937, 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. The most recent inspection on record was 05/26/2011. That was over 15 years ago.
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Location
| State | Wyoming |
| County | Weston |
| Nearest City | Edgemont, Sd |
| River/Stream | Little Frog Creek |
| Coordinates | 43.58018, -105.00945 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 420 ft |
| Year Completed | 1937 (89 years old) |
Storage & Hydraulics
| NID Storage | 53 acre-ft |
| Max Storage | 53 acre-ft |
| Normal Storage | 53 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 2 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Usda Fs |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 05/26/2011 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01923 |
| Federal ID | WY01923 |
| More Info | State Dam Safety Program |