In the 1960s, the Clara Barton Parkway swallowed up large swaths of sloping land between Glen Echo and the Potomac. ???Residents felt that they had been barred from one of the most alluring aspects of Glen Echo,??? writes longtime resident Carlotta Anderson in her book, ???Glen Echo: The Remarkable Saga of a Very Small Town.??? About the same time, Glen Echo and other communities beat back a propo