Largest lakes & reservoirs in Montana by acres
There is no widely-accepted minimum surface area that defines a lake. What LakeLubbers describes as a lake, you might call a pond. Acreage of a lake (or sometimes square kilometers) is most often measured at the top surface area when the lake is at normal elevation. The surface area can be considerably smaller or larger when lake levels are lower or higher than normal. North America’s Lake Superior is the world’s largest freshwater lake by this measure.The other measure of a lake’s size is the lake’s water volume. By that measure, the world’s largest freshwater lake is Lake Baikal in Siberia.
You can find many of the world’s largest lakes (acres) on LakeLubbers in the comparison table below. Note: For some lakes, "Largest Lakes - Acres" data is unknown or does not apply, so you may see fewer lakes than the total 30 articles we have published for Montana lakes.
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Below are lakes within USA > US West Region > Montana > Compared by surface area in acres. This list does not represent all lakes in Montana, only the 30 Montana lake articles we have published on the LakeLubbers website.
Lake name  |
Surface area in acres |
Lake description |
|---|---|---|
| Ennis Lake (Gold West Country, MT, Montana, US West Region, USA) |
1,920 ac | In 1905 the Montana Power Company built a dam on the Madison River, creating Ennis Lake. The two and a half mile long lake stretches across Montana’s … |
| Bowman Lake, MT (Glacier Country, MT, Montana, US West Region, USA) |
1,724 ac | Bowman Lake is located in the northwest corner of scenic Waterton-Glacier International Peace Park. The crystal clear waters of Bowman Lake reflect th … |
| Kintla Lake (Glacier Country, MT, Montana, US West Region, USA) |
1,698 ac | One of the most remote campgrounds that can be reached by car in Glacier National Park graces the shore of Kintla Lake. Beautiful Kintla Lake lies in … |
| McGregor Lake (Glacier Country, MT, Montana, US West Region, USA) |
1,522 ac | Clear, deep McGregor Lake shines in northwestern Montana’s Glacier Country. Set against the backdrop of the Flathead National Forest and the Flathead … |
| Tally Lake (Glacier Country, MT, Montana, US West Region, USA) |
1,211 ac | Also known as Talley Lake Tally Lake, in Montana’s Glacier Country region, is fast becoming a favorite among the adventurous. Located 15 miles west of the town of Whitefish, th … |
| Seeley Lake, MT (Glacier Country, MT, Montana, US West Region, USA) |
1,025 ac | Tucked in the Clearwater Valley of western Montana lies a 1,025-acre body of water called Seeley Lake. This glacial lake is considered to be part of a … |
| Echo Lake MT (Glacier Country, MT, Montana, US West Region, USA) |
725 ac | Tiny islands, curving coves and wide bays are part of the allure of northern Montana’s Echo Lake. Coupled with mountains, wildlife, and the smell of t … |
| Quake Lake (Gold West Country, MT, Montana, US West Region, USA, Yellowstone Country, MT) |
582 ac | Also known as Earthquake Lake In a natural phenomenon seldom seen in today’s world, a massive earthquake and landslide created Montana’s Quake Lake in 1959. In pre-recorded history … |
| Thompson Chain of Lakes (Glacier Country, MT, Montana, US West Region, USA) |
557 ac | Also known as Loon Lake ,Horseshoe Lake, Chrystal Lake, Upper Thompson Lake, Middle Thompson Lake, Lower Thompson Lake, McGregor Lake, Lavon Lake, Little Loon Lake, Banana Lake, Bootjack Lake, Cad Lake, Cibid Lake, Lilly Pad Lake, Myron Lake, Rainbow Lake,Topless Lake Most visitors driving along US 2 in Montana’s Glacier Country region have likely admired the Thompson Chain of Lakes as they passed. Located about 45 … |
| Two Medicine Lake (Glacier Country, MT, Montana, US West Region, USA) |
400 ac | Also known as Middle Two Medicine Lake Two Medicine Lake in Glacier National Park is one of three popular lakes close together and sharing the Two Medicine name. The middle lake, usually re … |
| Leigh Lake (Glacier Country, MT, Montana, US West Region, USA) |
200 ac | Often described as one of the world’s most unique lakes, little Leigh Lake holds waters so clear that viewers feel as though they could reach down and … |
| Crystal Lake MT (Glacier Country, MT, Montana, US West Region, USA) |
186 ac | Spring-fed Crystal Lake is tucked away in a remote area of Montana’s Glacier County with mountains springing up on both sides. The 186-acre body of wa … |