The length of the new part of the dam (the mason work of the old dam not having been carried away) is 180 feet; so that with the mason work of the first erected dam, which still remains, it will make a dam of an overfall of 260 feet. The dam, when completed, will be about 50 feet high, having a base of masonry 65 feet wide and banked in, on the up stream side, with an em- ;

bankment 250 feet wide at base. The profile of the face of the dam corresponds with the curved form which the water will assume in pouring over it, and is coped with cut stone, in the most substantial manner.

At the toe of the dam, a heavy apron of crib work, 8 to 12 feet deep, and 53 feet wide, filled in with stone and planked, gives great security to that part of the work. With the view of keeping 4 feet of water on the apron at the toe of the dam, and thereby breaking the force of the fall, by its action on a body of water, there has been constructed, at a point 300 feet below the main dam, a secondary dam of timber and stone, which is 200 feet long and 9 feet high. The abutments of this secondary dam, with two piers of crib work, filled in with stone, have been used for the purpose of a bridge across the river, and will remain a bridge to accommodate the public and for the use of the keeper of the gate house.