Beaver Lake State Park
Beaver Lake State Park is a recognized dark sky location in North Dakota for stargazing and astronomy activities.
Bortle
Beaver Lake State Park is rated BORTLE CLASS 2.
Type
As a U.S. state park, various camping options may be available, including frontcountry camping, dispersed camping (boondocking), and backcountry (backpacking/primitive) camping. Also, electric bicycles are allowed on all trails (motorized and non-motorized). A permit may be required.
For more info, see their website. See also all dark sky places in ND.