Keep Cool is an earth dam located in Meagher County, Montana, built in 1950. It carries a Significant hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 400 ft long, taller than 68% 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 embankment section and the water level is illustrative.
About Keep Cool
The primary purpose of Keep Cool is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by William R Manger Estate (private). It impounds the Keep Cool Creek near Great Falls.
The dam stands 30 feet tall and stretches 400 feet across, has a maximum storage capacity of 342 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1950, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 10/29/1993. That was over 32 years ago.
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Location
| State | Montana |
| County | Meagher |
| Nearest City | Great Falls |
| River/Stream | Keep Cool Creek |
| Coordinates | 46.68220, -111.24690 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 400 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 342 acre-ft |
| Max Storage | 342 acre-ft |
| Normal Storage | 198 acre-ft |
| Drainage Area | 6 sq mi |
Ownership & Safety
| Purpose | Irrigation |
| Owner | William R Manger Estate |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 10/29/1993 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT00033 |
| Federal ID | MT00033 |
| More Info | State Dam Safety Program |