Whaley #11 Dam is a gravity dam located in Rosebud County, Montana. It carries a Low hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 26 ft26 ft tall and 487 ft long, taller than 55% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Whaley #11 Dam
Whaley #11 Dam is a dam in Rosebud, Montana. The dam is owned by Doi BLM (federal). It impounds the Rattlesnake Creek.
The dam stands 26 feet tall and stretches 487 feet across, creates a reservoir covering 25 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 2 square miles.
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. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 09/05/2018.
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Location
| State | Montana |
| County | Rosebud |
| River/Stream | Rattlesnake Creek |
| Coordinates | 46.64131, -106.79703 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 26 ft |
| Dam Length | 487 ft |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 134 acre-ft |
| Surface Area | 25 acres |
| Drainage Area | 2 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | Doi BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Poor |
| Last Inspection | 09/05/2018 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02753 |
| Federal ID | MT02753 |
| More Info | State Dam Safety Program |