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and staked down. This induces deposit of silt and checks <br />erosion. <br />STRUCTURES. <br />The headworks of the Fort Lyon Canal are very com- <br />plete and substantial structures, consisting of a wooden <br />dam 483 feet in length, with an apron resting on round <br />piles of oak, with two lines of sheet piles driven in paral- <br />lel rows across the river; and a headgate structure of <br />brick and stone masonry, resting on pile and plank foun- <br />dation. The dam proper, above the level of the apron, <br />is 6 feet in height, and is a mere sill or prolongation of <br />the round piles and sheet piles, covered with additional <br />planking. The sub - structure of the dam, below the wa- <br />ter line, is sound, and said to be good as new, but the <br />top requires to be rebuilt as the wood is decaying. The <br />proper structure to substitute for this will be one of rein- <br />forced concrete, to rest upon the sound piling of the <br />present dam. <br />The dimensions of the headgate are 80 feet by 20 feet, <br />with a clear waterway in the 13 openings of 65 feet, <br />each opening being 5 feet wide and 8 feet deep. In the <br />length of the structure are 12 brick division walls, or piers, <br />which divide the canal into the 13 bays, or passages, <br />each closed by a heavy wooden gate operated by rack <br />and pinion and lever of heavy cast iron. Excepting the <br />gates and the substructure of the roadway spanning the <br />water passages, the entire headgate is built of rock and <br />brick laid in Portland cement mortar, and resting on solid <br />pile and cement concrete foundation. On the canal side <br />of the gate structure is a double wooden floor, or apron, <br />loaded with stone between the floors, for protection <br />M. <br />