Five minutes more and we are at the dam. There is no station, except a little wooden platform, and we had to scramble over a rough hill to get down to the dam. The gorge there is probably one hundred feet wide and several hundred feet deep, with almost perpendicular sides. There is no other vegetation visible than grass and a few low shrubs scattered around. It is a most excellent place for a dam. The Sweetwater dam is built almost entirely of masonry and cement, and, both as regards construction and size, is one of the very best in the world. It is built in the shape of an arch, with the convex part up stream, and gives an impression of solidity and safety not always found in structures of this kind. The masonry dam is forty-six feet wide at the bottom, at the top twelve feet. The length of the top is 340 feet, and at the bottom of the cañon the base of the dam is about one hundred feet, while the height is about ninety feet in the center. At one end of the dam is a wasteway and gates for letting the water out in case of a flood. The gates slide on an inclined plane, and consist simply of three-inch boards with pegs in each end, which are caught by a hook when they are to be raised. The capacity of the wasteway is said to be fifteen hundred cubic feet per second, or as much as the Sweetwater river is ever likely to carry, even during flood time. For one who is accustomed to headgates and waterways in the Fresno canals, this waterway looks very small indeed. But the engineers say it is large enough, and we suppose they must be right. The water is delivered through a large iron pipe thirty-six inches in diameter, covered for some distance down the cañon with masonry. For 29,807 feet, this pipe line runs down the valley or on the mesa lands adjoining it. It will deliver fifty million gallons of water per day, and can now irrigate ten thousand acres of land. The whole cost of construction was $502,000, and the time consumed in building was two years. The reservoir, as it now stands, is a magnificent sheet of water with tributary watersheds of 186 square miles, and a water surface of about three and one-half square miles. It is a grand illustration of the enterprise of the San Diego capitalists, of the skill and success of the California engineers, and of what may possibly be accomplished on nearly every stream in San Diego county. It is a structure of which any country might be proud, and which has few equals and no superiors anywhere in the world.