There are at least 3,223 named lakes and reservoirs in Montana. The following list contains lists of lakes and reservoirs in Montana by county.
A lake is a terrain feature (or physical feature), a body of liquid on the surface of a world that is localized to the bottom of basin (another type of landform or terrain feature; that is not global). Another definition is a body of fresh or salt water of considerable size that is surrounded by land. On Earth a body of water is considered a lake when it is inland, not part of the ocean, is larger and deeper than a pond.
A reservoir (etymology from French réservoir a "storehouse Online Etymology Dictionary - Reservoir) is an artificial lake used to store water. Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such a brickwork or cast concrete. Swimming, fishing, and/or boating are permitted in some of these lakes, but not all.
Lists of Montana lakes List of lakes of Beaverhead County, Montana List of lakes of Big Horn County, Montana List of lakes of Blaine County, Montana List of lakes of Broadwater County, Montana List of lakes of Carbon County, Montana List of lakes of Carter County, Montana List of lakes of Cascade County, Montana List of lakes of Chouteau County, Montana List of lakes of Custer County, Montana List of lakes of Daniels County, Montana List of lakes of Dawson County, Montana List of lakes of Deer Lodge County, Montana List of lakes of Fallon County, Montana List of lakes of Fergus County, Montana List of lakes of Flathead County, Montana (A–L) List of lakes of Flathead County, Montana (M–Z) List of lakes of Gallatin County, Montana List of lakes of Garfield County, Montana List of lakes of Glacier County, Montana List of lakes of Golden Valley County, Montana List of lakes of Granite County, Montana List of lakes of Hill County, Montana List of lakes of Jefferson County, Montana List of lakes of Judith Basin County, Montana List of lakes of Lake County, Montana List of lakes of Lewis and Clark County, Montana List of lakes of Liberty County, Montana List of lakes of Lincoln County, Montana List of lakes of Madison County, Montana List of lakes of McCone County, Montana List of lakes of Meagher County, Montana List of lakes of Mineral County, Montana List of lakes of Missoula County, Montana List of lakes of Musselshell County, Montana List of lakes of Park County, Montana List of lakes of Petroleum County, Montana List of lakes of Phillips County, Montana List of lakes of Pondera County, Montana List of lakes of Powder River County, Montana List of lakes of Powell County, Montana List of lakes of Prairie County, Montana List of lakes of Ravalli County, Montana List of lakes of Richland County, Montana List of lakes of Roosevelt County, Montana List of lakes of Rosebud County, Montana List of lakes of Sanders County, Montana List of lakes of Sheridan County, Montana List of lakes of Silver Bow County, Montana List of lakes of Stillwater County, Montana List of lakes of Sweet Grass County, Montana List of lakes of Teton County, Montana List of lakes of Toole County, Montana List of lakes of Treasure County, Montana List of lakes of Wheatland County, Montana List of lakes of Wibaux County, Montana List of lakes of Valley County, Montana (A–L) List of lakes of Valley County, Montana (M–Z) List of lakes of Yellowstone County, Montana
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