Mcgilla Gorilla #50 dam
Mcgilla Gorilla #50
Mcgilla Gorilla #50, also known as Jerrys Lake, is a privately owned structure located in Lincoln, Montana. This dam, completed in 1970, serves multiple purposes including fire protection, stock, and small fish pond management. With a height of 20 feet and a length of 250 feet, it has a storage capacity of 124 acre-feet, making it a significant water resource in the area.
Situated on McGinnis Creek, Mcgilla Gorilla #50 is regulated by the Montana Department of Natural Resources and Conservation (DNRC) and is subject to state permitting, inspection, and enforcement. The dam has a significant hazard potential and is currently rated as "Not Rated" in terms of its condition assessment. Despite being a private structure, it plays a crucial role in water management and conservation efforts in the region.
Owned by a private entity, Mcgilla Gorilla #50 is a key component of the water infrastructure in Libby, Montana. With its earth dam type and storage capacity of 124 acre-feet, the dam provides essential water resources for fire protection, livestock, and small fish pond maintenance. Its location on McGinnis Creek makes it a vital asset for water management in the area, with the Montana DNRC overseeing its regulatory activities to ensure its safe operation and maintenance.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Mcgilla Gorilla #50 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Thompson River Near Thompson Falls Mt | 292 cfs | → |
| Mill Cr Ab Bassoo Cr Nr Niarada Mt | 2 cfs | → |
| Prospect Creek At Thompson Falls Mt | 101 cfs | → |
| Fisher River Near Libby Mt | 163 cfs | → |
| Kootenai River Bl Libby Dam Nr Libby Mt | 9,980 cfs | → |
| Nf Coeur D Alene R Ab Shoshone Ck Nr Prichard Id | 111 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mcgilla Gorilla #50.
Boat launches
See all →
Campgrounds
See all →
Fishing spots
See all →
River runs
See all →
More reservoirs
See all →
About Mcgilla Gorilla #50
Where does the data for Mcgilla Gorilla #50 come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Significant hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card below for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.