Public Bath No. 10 at the foot of West 51st Street and the Hudson River, ca. 1902 The city’s floating baths — public bathing areas on the city’s waterways, enclosed by floating pontoons — were introduced in 1870, but unofficial bathing areas existed decades earlier. Bathing hours were gender segregated, with dips limited to 20 minutes, and free to the public. The 1901 edition of the New York City Red Book lists six such baths on the Hudson, including this swimming area at the foot of West 51st Street.

In the late 19th and early 20th century the densely crowded neighborhoods of New York, whose apartments lacked bathing facilities, combined with a progressive civic action to create a peculiar and somewhat short-lived (for its original purpose) municipal facility: the public bath house. In the 19th century, public baths, of a sort, were established as floating pools in the rivers during the hot summer months. A few "People's Baths" were built with private funds through the Association for Improving the Condition of the Poor prior to 1900. In 1895 the passage of a state-wide law required the construction of public bathing facilities in the state's largest cities. The first truly municipal bath opened on Rivington Street in 1901. Many of the resulting public baths were architecturally impressive, both inside and out. The complexes usually included laundry facilities, a swimming pool, and separate tubs for men and women. The immediate need for the baths diminished some with the passage of the 1901 Tenement House Act, which required new apartments to provide toilet facilities. (Many, though not all, landlords also included baths.) Yet the public baths saw periods of high volume especially in the summer months. The year 1920 saw 7.5 million baths taken in these 20 facilities. In the 1930s some of the baths were renovated by the WPA. By the mid century, the public baths were closing and being demolished or being converted to other usages. Some facilities located in parks were made into recreational facilities. The final bath to close, in 1975, was the Allen Street Bath at 133 Allen Street.