This monograph discusses nearly two centuries of the history of Foggy Bottom, a small but distinctive section of the District of Columbia situated at the junction of the Potomac River and Rock Creek. As in the case of most urban neighborhoods, its precise boundaries are a matter of dispute. There is no question, however, that historically Foggy Bottom was divided into two sections. The part between 17th and 23rd Streets was an upper-income neighborhood during much of the nineteenth century. The section between 23rd Street on the east and Georgetown on the west and between the Potomac River on the south and Pennsylvania Avenue on the north was more industrial and house lower-income residents.