Long Island Sound Stewardship Act of 2004 - Establishes the Long Island Sound Stewardship System Region in Connecticut and New York.
Establishes the Long Island Sound Stewardship Coordinating Committee to evaluate applications: (1) from owners or other controlling parties to have qualifying land within the Region designated as "stewardship sites" for purposes of awarding preservation funds; and (2) from government or nonprofit organizations qualified to hold conservation easements for funds to purchase land or development rights for stewardship sites.
Requires the Committee to develop and publish a management plan that describes the current status of Long Island Sound, the Committee's role in protecting it, and details of the stewardship site designation program.