It has no surface outlets, so by some definitions, it is endorheic; however, it possibly drains by underground channels into the Baraboo River, which would make the lake cryptorheic.

Devil's Lake was so named because it is situated in a deep chasm that was thought to have no visible inlet or outlet.

The original inhabitants of the area around the lake date back much further than when the European settlers first discovered the land.

During the ice age, a lobe of the glacier passed to the east of the Baraboo Hills and came up the river valley.

It deposited materials and then melted, leaving a terminal moraine blocking the river, forming an earthen dam.

The Devil's Lake State Park is made up of bluffs that are believed to be one of the most ancient surface rock area in North America.

Formed about 1.6 billion years ago, the land consists of Northern and Southern mountain ranges that are made up of quartzite rock.

Over time, that sediment accumulated into sandstone and underwent immense heat and pressure to form the non-porous metamorphic rock that now encompasses the Baraboo valley.

Naturally occurring fish include bass and panfish, while walleye, northern pike, and trout are stocked by the Wisconsin DNR.

[13] Swimmer's itch (cercarial dermatitis) is a common problem at Devil's Lake, most apparent during the summer months.

The park advises visitors to stay alert for algae blooms, which can appear discolored, streaky, or with floating scum or globs on the surface.

[24] Devils Lake State Park offers 29 miles of hiking trails that vary based on difficulty level, length, and terrain.