The “Sewer Map of the City of Oakland” from 1880 is a detailed map that illustrates the sizes and depths of the city’s sewer system, as well as the grades of streets. Created as part of a report on the social statistics of cities, this map provides valuable insights into the infrastructure and urban planning of Oakland during that period. It highlights the importance of the sewer system in the city’s development and offers a historical perspective on public health and sanitation efforts in the late 19th century.