Gibson, also known as Beaver Creek or Gibson Reservoir, is a federal-owned structure located in Simms, Montana.
Wind
Humidity
It was completed in 1928 by the Bureau of Reclamation for the primary purpose of irrigation on the North Fork Sun River. This concrete dam stands at a height of 199 feet and has a storage capacity of 121,981 acre-feet, with a normal storage level of 99,059 acre-feet.
The reservoir covers a surface area of 1,420 acres and has a drainage area of 575 square miles. With a maximum discharge capacity of 50,000 cubic feet per second, Gibson has a controlled spillway with a width of 204 feet to manage water flow. The dam's hazard potential is classified as high, and it underwent modifications in 1981 for both hydraulic and structural enhancements.
Although the condition assessment of Gibson is currently not available, the risk assessment for the dam is rated as very high. Emergency action plans have been prepared, with the last revision in November 2014. With its significant role in irrigation and water resource management in the region, Gibson remains a key infrastructure for water supply and climate resilience efforts in Montana.
Years Modified |
1981 - Hydraulic, 1981 - Structural |
Year Completed |
1928 |
Dam Length |
960 |
Dam Height |
199 |
River Or Stream |
NORTH FORK SUN RIVER |
Primary Dam Type |
Concrete |
Surface Area |
1420 |
Hydraulic Height |
196 |
Drainage Area |
575 |
Nid Storage |
121981 |
Structural Height |
199 |
Hazard Potential |
High |
Foundations |
Rock |
Nid Height |
199 |
| Location | Reservations | Toilets |
|---|---|---|
Mortimer Gulch
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Mortimer Gulch Campground
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Home Gulch
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Home Gulch Campground
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Benchmark Campground
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Benchmark
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