Mcgilla Gorilla #50 is an earth dam located in Lincoln County, Montana, built in 1970. It carries a Significant hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall and 250 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 Mcgilla Gorilla #50
The primary purpose of Mcgilla Gorilla #50 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Gerald Neils (private). It impounds the Mcginnis Creek near Libby.
The dam stands 20 feet tall and stretches 250 feet across, and has a maximum storage capacity of 124 acre-feet. Completed in 1970, the structure is well into its service life at over 50 years 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.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Montana |
| County | Lincoln |
| Nearest City | Libby |
| River/Stream | Mcginnis Creek |
| Coordinates | 47.95831, -115.21441 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 250 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 124 acre-ft |
| Max Storage | 124 acre-ft |
| Normal Storage | 63 acre-ft |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Gerald Neils |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MT03598 |
| Federal ID | MT03598 |
| More Info | State Dam Safety Program |