Deepest lakes & reservoirs in Idaho by maximum depth (ft)
The estimated greatest depth of the water in a lake can be measured at the lake’s normal elevation. If the water volume and surface area of a lake are known, an estimate of the lake’s average depth can be calculated:Water volume ÷ Surface Area = Average Depth
Example: 1,000,000 acre-feet ÷ 20,000 acres = 50 feet average depth.
You can find many of the the world’s deepest lakes on LakeLubbers. If you sort the list, you will find the (maximum depth of) the shallowest lakes in our database. Note: For some lakes, lake depth data is unknown, so this table may display fewer lakes than the total 23 articles we have published for Idaho lakes.
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Below are lakes within USA > US West Region > Idaho > Compared by maximum depth in feet. This list does not represent all lakes in Idaho, only the 23 Idaho lake articles we have published on the LakeLubbers website.
Lake name  |
Max depth in feet |
Lake description |
|---|---|---|
| Magic Reservoir (Central Idaho, Idaho, US West Region, USA) |
120 ft | There is magic to be found in central Idaho: Magic Reservoir! This expanse of water was created in 1909 when the Big Wood River was dammed to provide … |
| C. J. Strike Reservoir (Idaho, Southwestern Idaho, US West Region, USA) |
102 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 … |
| Island Park Reservoir (Eastern Idaho, Idaho, US West Region, USA) |
75 ft | Just half an hour southwest of west Yellowstone, MT, Island Park Reservoir hosts a recreational paradise all its own. The roughly 7000-ace reservoir i … |
| Lake Cascade, ID (Idaho, Southwestern Idaho, US West Region, USA) |
70 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 … |
| Twin Lakes ID (Idaho, Northern Idaho, US West Region, USA) |
60 ft | The scenery at northern Idaho’s Twin Lakes is nothing to scoff at. With lush mountains looming on either side of this 850-acre crystalline lake, bald … |
| Independence Lakes (Idaho, South Central Idaho, US West Region, USA) |
60 ft | Independence Lakes in Idaho’s Sawtooth National Forest are at the end of one of south central Idaho’s most popular hiking trails in the Albion Mountai … |
| American Falls Reservoir, ID (Idaho, Southeastern Idaho, US West Region, USA) |
53 ft | With more than 56,000 acres of water sport, boating and fishing waters, surrounded by choice camping and picnic areas, American Falls Reservoir in sou … |
| Cocolalla Lake (Idaho, Northern Idaho, US West Region, USA) |
40 ft | Cocolalla Lake, located in Idaho’s Northern Region, is an example of the recreational opportunities the Panhandle has to offer. The 805-acre lake is l … |
| Hauser Lake, ID (Idaho, Northern Idaho, US West Region, USA) |
40 ft | Hauser Lake is located at the southernmost edge of the Selkirk Mountains in northern Idaho. Like many lakes in the Panhandle area, Hauser Lake was for … |
| Henrys Lake (Eastern Idaho, Idaho, US West Region, USA) |
21 ft | Also known as Henry's Lake Reservoir Hidden in the far north corner of Eastern Idaho, just over the border from both Montana and Wyoming, Henrys Lake attracts thousands of visitors every … |