POTOMAC

Set to 3 different clues across 3 published puzzles, most often “Foggy Bottom's river” — The New York Times, Wednesday, 22 March 2006.

7 letters

Every clue on record, most used first

Foggy Bottom's riveronce
The New York Times — Wednesday, 22 March 2006
River name meaning "where the goods are brought in"once
The New York Times — Sunday, 4 January 1998
The Key Bridge spans itonce
The New York Times — Wednesday, 27 September 1995