Koss #3
Koss #3 is an earth dam located in Phillips County, Montana, built in 1945. It carries a Low hazard potential classification.
About Koss #3
The primary purpose of Koss #3 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Edwin N Koss (private). It impounds the Tr-second Creek.
The dam stands 20 feet tall and stretches 350 feet across, creates a reservoir covering 19 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1945, 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.
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Location
| State | Montana |
| County | Phillips |
| Nearest City | None |
| River/Stream | Tr-second Creek |
| Coordinates | 47.83120, -107.77620 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 350 ft |
| Year Completed | 1945 (81 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 150 acre-ft |
| Surface Area | 19 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 250 cfs |
Ownership & Safety
| Purpose | Irrigation |
| Owner | EDWIN N KOSS |
| Owner Type | Private |
| Hazard Classification | Low |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT02865 |
| Federal ID | MT02865 |
| More Info | State Dam Safety Program |