Allegheny Islands State Park was created in 1980.
Allegheny Riverfront Park was created in 1998.
At Point State Park in Pittsburgh, the Allegheny River is approximately 800 feet wide. This width can vary slightly depending on seasonal changes and local water levels. The park is situated at the confluence of the Allegheny, Monongahela, and Ohio rivers, providing a scenic view of the rivers' meeting point.
Brampton Islands National Park was created in 1968.
Brook Islands National Park was created in 1994.
Newry Islands National Park was created in 1938.
Whitsunday Islands National Park was created in 1944.
Forbes Islands National Park was created in 1990.
Hope Islands National Park was created in 1939.
Piper Islands National Park was created in 1989.
Orango Islands National Park was created in 2000.
Family Islands National Park was created in 1994.
Saunders Islands National Park was created in 1989.