The arch of this bridge is 88 feet span, and about 70 feet in height from the bed of the creek. The centres for turning this large arch, have been up for some time past, and thirty courses of the arch stone laid. The aqueduct proceeds from the Sing Sing tunnel, crossing both the aforesaid street and creek, from north to south. 3d. An archway over the Highland turnpike, now highway, about eleven miles below the Croton dam, of 20 feet span, and 14 feet in height. 4th. The large culvert on Mill River, requiring an arch of 25 feet span, and 170 feet in length, situated about thirteen miles below the Croton dam. The depression of the valley through which this stream passes, is 72 feet below grade, and the height of the foundation wall, including the aqueduct, reaches to 87 feet above the bed of the river.

5th. A very expensive archway, forming a carriage way under the aqueduct, at Jewell's Brook, about seventeen miles from the Croton dam, of 14 feet span, and 125 feet in length. The foundation wall at this place is 50 feet in height to grade, and 62 feet to the top filling of the aqueduct. 6th. An aqueduct bridge over the railroad at Harvey's marble quarry, of 16 feet span, and 10 feet in height. 7th. An archway over the road at Saw Mill River, of 16 feet span, and 14 feet in height. 8th. The large double culvert on Saw Mill River, with arches of 25 feet span each and 82 feet in length. The river is 42 feet below grade, and to the top of the aqueduct, 56 feet. The two last structures are connected, the aqueduct passing over both of them, in its course to the city These important pieces of workmanship, are composed of the first quality of building stone, hammer dressed, and well bedded together.