[J. Thomas Scharf (1886)] mentioned, there are numerous brooks and valleys, of less depth, requiring culverts and artificial founda-tions to support the work. The culverts number one hundred and fourteen, and their aggregate length is nearly eight thousand feet. The span varies from one and a half to twenty-five feet. There are five road culverts of from fourteen to twenty-feet span. All the culverts are of stone, laid in hydraulic cement. The line is embellished at frequent intervals with massive viaducts and bridges, which render it impos-ing, and at times picturesque. The prettiest picture along the way is perhaps at Sleepy Hollow, and the grandest about Sing Sing Kill. The greatest interior width of the aqueduct is seven feet five inches, and the greatest height, eight feet HIGH BRIDGE. and heavy filling in deep ravines. There are on the line sixteen tunnels, varying in length from a hundred and sixty to over twelve hundred feet, and making an aggregate length of nearly seven thousand feet; and the height of the ridges, above the grade-level at the tunnels, rangesfrom twenty-five to seventy-five feet. In Westchester County twenty-five streams cross theline of the aqueduct, which are from twelve to seventy feet below the grade-line, and from twenty-five to eighty-three feet below the top covering of the aqueduct.