B. ROCK FILL, CREST, AND MIDDLE CORE WALLS OF THE LAGUNA DAM, YUMA PROJECT, 4. CORE WALLS AND ROCK FILL, LAGUNA DAM, YUMA PROJECT, CALIFORNIA-ARIZONA, LOOKING ACROSS THE DAM FROM BELOW THE LOWER CORE WALL, MARCH 28, 1906. B. SECTION OF ROCK PAVING BETWEEN CORE WALLS OF LAGUNA DAM, YUMA PROJECT, CALIFORNIA-ARIZONA, MARCH 28, 1906. semitropical fruits, and forage products, seven crops of alfalfa being raised in many places. The distribution of the lands under the project is shown by the following table: CONDITIONS IN IMPERIAL VALLEY. Since the California Development Company, operating under a different name as a Mexican organization, made the dredger cut at what is known as the Mexican heading into the Imperial canal, many attempts have been made to turn the Colorado back into its old. channel. At first, the magnitude of the undertaking was not at all appreciated and the early attempts at closure were futile, owing both to poor judgment in the method of closure and to lack of available funds. About a year ago a more determined attempt was made and a brushand-mat dam, supplemented by piles, was driven across the line of the intake. This attempt had raised the water between 2 and 3 feet, when the great flood in the Gila of November, 1905, overtopped it and destroyed the entire work. From that time on the new channel of Colorado River, which followed the old Imperial canal, became wider and deeper until the entire flow of Colorado River, even during the great flood season, was passing down into the Imperial Valley, overflowing the country, destroying ranches, and filling up the Salton Sea. The rising of the water in the Salton Sea compelled continual changes in the location of the Southern Pacific Railroad tracks and forced upon the management an appreciation of the enormous damage that would result unless the river were permanently restored to its old channel. At Pilot Knob, 4 miles above the break, permanent concrete headworks were constructed, and to the south of the new channel of |