Hanson Co #11 is an earth dam located in Rosebud County, Montana, built in 1962. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 275 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 Hanson Co #11
The primary purpose of Hanson Co #11 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Hanson Sheep Co (private). It impounds the Tr-little Porcupine Creek near Cartersville.
The dam stands 15 feet tall and stretches 275 feet across, has a maximum storage capacity of 135 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1962, 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 | Rosebud |
| Nearest City | Cartersville |
| River/Stream | Tr-little Porcupine Creek |
| Coordinates | 46.73180, -106.79140 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 275 ft |
| Year Completed | 1962 (64 years old) |
Storage & Hydraulics
| NID Storage | 135 acre-ft |
| Max Storage | 135 acre-ft |
| Normal Storage | 61 acre-ft |
| Drainage Area | 1 sq mi |
| Max Discharge | 800 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Hanson Sheep Co |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01936 |
| Federal ID | MT01936 |
| More Info | State Dam Safety Program |