Anderson Lake State Forest
Anderson Lake State Forest is a recognized dark sky location in Illinois for stargazing and astronomy activities.
Bortle
Anderson Lake State Forest is rated BORTLE CLASS 3.
Type
As a U.S. state forest, dispersed camping, also known as boondocking, is permitted away from car/RV campsites. This allows you to find even darker skies. A permit may be required.
For more info, see their website. See also all dark sky places in IL.