[2] Originally the site of Gray's Quarry, a gravel and sand pit, Indigo Lake came under the responsibilities of the National Park Service on December 27, 1974, with the creation of the Cuyahoga Valley National Recreation Area.

[3] The pit was later filled with water by park service personnel to create what was subsequently called "Indigo Lake", which remains in place sustained by a constant supply of water from several natural springs in the immediate area.

[5] Although protected as part of the national park, the lake is a popular spot for local fishing.

[6] In addition, the lake, which normally freezes over in the colder months of the year, is used by the Akron Fire Department to practice under-ice rescue techniques each winter.

[7] It is accessible by car from Riverview road, on foot via the Ohio & Erie Canal Towpath Trail, and by rail via a flag stop station nearby at 41°11′39″N 81°34′45″W / 41.19417°N 81.57917°W / 41.19417; -81.57917 (Indigo Lake), part of the Cuyahoga Valley Scenic Railroad.