It was completed in its present form in the early 1960s. In 2005, the entire highway, including its supporting structures, was listed on the National Register of Historic Places in recognition of its historic importance in the development of parkways in the 20th century, and Roosevelt's role in creating it. It is the second-longest continuous road listed on the Register after Virginia's Skyline Drive, and the longest limited-access highway.The next longest is the Baltimore–Washington Parkway at .
