The beauty of irrigation on the Columbia is that it can be made to pump itself. For by taking advantage of such a fall as that of Priest Rapids (a half million horse-power at ordinary water), electric power can be generated by which limitless water can be raised sufficiently to cover any desired amount of land. Some have expressed the opinion that this process would exhaust the River, but this is hardly possible. For the great demands are in June and July when the River is at its flood. It has been estimated that at low water the Columbia at Celilo discharges 125,000 cubic feet per second, and at extreme high water, 1,600,000 cubic feet per second. Such a prodigious volume of water would be scarcely at all affected by any possible withdrawals. The River from the foot of Priest Rapids is regularly navigated by several steamers connecting the new lands and towns with Pasco, the railroad centre seventy miles below. This section of the River is deep and tranquil, a superb watercourse. Below Hanford the River receives the Yakima River, which is the important agent in the irrigation of the great Yakima Valley. No one could say that he knew the Columbia River or the State of Washington without a visit to that valley, the largest in the State and the scene of the most extensive development in irrigated lands anywhere in the North-west. Three thousand carloads of fruit and vegetables were shipped from the Yakima in 1907. Buyers of Yakima fruits come from all parts of the East, from England, and even from France. Fortunes have been made in that fair land,--a fair land when supplied with water, but an arid waste without it. The United States Government has acquired control of most of the water system of the Yakima, and by means of storage basins in the mountain lakes where the Yakima and its branches rise, will be able to supply water for over a million acres of land. [Illustration: On the Historic Walla Walla River. Photo. by W. D. Chapman.]