This 88-acre bird sanctuary in the middle of the Potomac River is dedicated to our 26th President. Explore 2.5 miles of trails and the Memorial Plaza. Theodore Roosevelt Island is accessible only from the northbound lanes of the George Washington Memorial Parkway. The entrance to the parking lot is located just north of the Roosevelt Bridge. Southbound traffic: take Theodore Roosevelt Bridge to Constitution Ave. Take a right on 23rd St. and cross Memorial Bridge. Once on the bridge, bear right to return to the G.W. Parkway.