Largest lakes & reservoirs in Southwestern Idaho by water volume
The estimated volume of water that a lake contains is measured at the lake’s normal elevation. By this measure, the world’s largest freshwater lake is Siberia’s Lake Baikal.Water Volume can be measured in acre-feet, in cubic miles, or in cubic kilometers. One acre-foot is the amount of water needed to cover one acre (43,560 square feet) to a depth of one foot. One cubic mile equals 3,379,200 acre-feet. One cubic kilometer equals 810,713 acre-feet. 1 acre-foot is equal to 325,851 US gallons. Siberia’s Lake Baikal contains about 6,276,367,740,000,000 gallons of freshwater – nearly 1 million gallons for every living person on earth.
The other – and more widely used – measure of a lake’s size is the lake’s surface acreage. By that measure, the world’s largest freshwater lake is North America’s Lake Superior.
Note: In the United States, an acre foot is a unit of volume used to refer to large-scale bodies of water. It is defined by the volume of water needed to cover 1 acre of surface area to a depth of 1 foot.
You can find many of the the world’s largest lakes (by water volume) on LakeLubbers. Note: For some lakes, the water volume data is unknown or does not apply, so you may see fewer lakes than the total 7 articles we have published for Southwestern Idaho lakes.
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Below are lakes within USA > US West Region > Idaho > Southwestern Idaho > Compared by water volume. This list does not represent all lakes in Southwestern Idaho, only the 7 Southwestern Idaho lake articles we have published on the LakeLubbers website.
Lake name  |
Water vol. in ac-ft |
Lake description |
|---|---|---|
| Hells Canyon Reservoirs (Eastern Oregon, Idaho, Oregon, Southwestern Idaho, US West Region, USA) |
1,420,000 ac-ft | (Also known as Brownlee Reservoir, Oxbow Reservoir, Hells Canyon Reservoir) The three Hells Canyon Reservoirs are one of southwest Idaho’s most scenic locations. Idaho can’t claim this national treasure alone, however as it sh… |
| Lake Cascade, ID (Idaho, Southwestern Idaho, US West Region, USA) |
693,100 ac-ft | (Also known as Cascade Reservoir) Lake Cascade (Cascade Reservoir) is the fourth largest lake in Idaho, creating an extensive and diverse recreation site for visitors. Its nearly 30,00… |
| Anderson Ranch Reservoir (Idaho, Southwestern Idaho, US West Region, USA) |
413,100 ac-ft | One of the true gems of the Idaho reservoir system is Anderson Ranch Reservoir. Completed along the South Fork of the Boise River in 1950, this projec… |
| Arrowrock Reservoir (Idaho, Southwestern Idaho, US West Region, USA) |
272,200 ac-ft | One in a string of three major reservoirs built to irrigate the parched Boise Valley, Arrowrock Reservoir has contributed to water recreation in south… |
| Lucky Peak Lake (Idaho, Southwestern Idaho, US West Region, USA) |
264,400 ac-ft | (Also known as Lucky Peak Reservoir) Home of Idaho’s most visited state park, Lucky Peak Lake (sometimes called Lucky Peak Reservoir) covers over 3,000 acres just outside of the capital c… |
| C. J. Strike Reservoir (Idaho, Southwestern Idaho, US West Region, USA) |
247,000 ac-ft | The C. J. Strike Reservoir in Southwestern Idaho offers a wealth of opportunities to enjoy nature. Formed in 1952 when a hydroelectric dam was built a… |