Mckinley Lake is an earth dam located in Missoula County, Montana, built in 1923. It carries a Significant hazard potential classification.
Dam profile
NID height · 7 ft7 ft tall and 364 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 Mckinley Lake
The primary purpose of Mckinley Lake is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City of Missoula (local government). It impounds the Tr-lake Creek near Missoula.
The dam stands 7 feet tall and stretches 364 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 168 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1923, the structure is over a century old.
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 08/01/2017.
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Location
| State | Montana |
| County | Missoula |
| Nearest City | Missoula |
| River/Stream | Tr-lake Creek |
| Coordinates | 47.01880, -113.92090 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 364 ft |
| Year Completed | 1923 (103 years old) |
Storage & Hydraulics
| NID Storage | 168 acre-ft |
| Max Storage | 168 acre-ft |
| Normal Storage | 152 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 91 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Missoula |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 08/01/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT01460 |
| Federal ID | MT01460 |
| More Info | State Dam Safety Program |