The Deepwater Horizon oil spill , beginning 20 April 2010 , released masses of oil and tar which began washing ashore , in varying amounts , along the Gulf Islands National Seashore on 1 June 2010 . On 23 June 2010 , wave after wave of oil pools and globs began covering the beaches on Santa Rosa Island , resulting in a fishing and swimming ban . The oil-spill disaster affected every large island in the group
Deepwater Horizon oil spill
Deepwater Horizon oil spill
Gulf Islands National Seashore