League Island was an island in the

Delaware River The Delaware River is a major river in the Mid-Atlantic region of the United States and is the longest free-flowing (undammed) river in the Eastern United States. From the meeting of its branches in Hancock, New York, the river flows for a ...

, part of the city of

Philadelphia Philadelphia ( ), colloquially referred to as Philly, is the List of municipalities in Pennsylvania, most populous city in the U.S. state of Pennsylvania and the List of United States cities by population, sixth-most populous city in the Unit ...

, just upstream from the mouth of the

Schuylkill River The Schuylkill River ( , ) is a river in eastern Pennsylvania. It flows for U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map(). accessed April 1, 2011. from Pottsville, Pennsylvania, Pottsville ...

. The island was developed as the Philadelphia Naval Shipyard. Since the late 20th century, it has been redeveloped and now operates primarily as an industrial park under the name "The Navy Yard". League Island no longer exists as an island, since the Back Channel, which separated it from the mainland, was closed at the eastern end to create land for

Mustin Field Henry C. Mustin Naval Air Facility , also known as NAF Mustin Field, is a former military airfield located at the United States Navy Naval Aircraft Factory on board the Philadelphia Naval Shipyard, Philadelphia, Pennsylvania. It was in service fr ...

, a military airfield. This was closed in 1963. The western end of the channel became the present Reserve Basin, which holds the ships of the U.S. Navy's

reserve fleet A reserve fleet is a collection of naval vessels of all types that are fully equipped for service but are not currently needed; they are partially or fully Ship decommissioning, decommissioned. A reserve fleet is informally said to be "in mothba ...

External links

League Island
at

Flickr Flickr ( ) is an image hosting service, image and Online video platform, video hosting service, as well as an online community, founded in Canada and headquartered in the United States. It was created by Ludicorp in 2004 and was previously a co ...

{{authority control Landforms of Philadelphia River islands of Pennsylvania Former islands of the United States