Upper Twin Lakes
Upper Twin Lakes is an earth dam located in Ravalli County, Montana, built in 1964. It carries a Low hazard potential classification.
About Upper Twin Lakes
The primary purpose of Upper Twin Lakes is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Charlos Irrigation District (local government). It impounds the Lost Horse Creek near Hamilton.
The dam stands 14 feet tall and stretches 450 feet across, creates a reservoir covering 31 acres, has a storage capacity of 220 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1964, 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. The most recent inspection on record was 08/01/1989. That was over 36 years ago.
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Location
| State | Montana |
| County | Ravalli |
| Nearest City | Hamilton |
| River/Stream | Lost Horse Creek |
| Coordinates | 46.16070, -114.49850 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Height | 14 ft |
| Dam Length | 450 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 220 acre-ft |
| Normal Storage | 220 acre-ft |
| Surface Area | 31 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | CHARLOS IRRIGATION DISTRICT |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Last Inspection | 08/01/1989 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01166 |
| Federal ID | MT01166 |
| More Info | State Dam Safety Program |