Hydrographic Map Showing Line of Croton Aqueduct (1846) Detailed map from the NYPL Map Division showing the complete route of the Croton Aqueduct from the Croton Dam through Westchester County to Manhattan. Compiled under the direction of chief engineer John B. Jervis. Shows the relationship of the aqueduct to rivers, hills, and settlements along its 41-mile route. Date: 1846 Type: map Subjects:…