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Show Record From North wash to the mouth of the San Juan, mile 78 1\ 2 I made notes on the map of the depth of the water at certain places and of my observations of bars, rapids and groundings. Beginning 1260 at the mouth of the San Juan we began to encounter sand waves. I simply made a general note, " sand waves" between mile 78 to mile 1261 74. I had never seen them before. I estimated that from crest to crest, some of the worst of these waves was not more than 10 or 12 feet from crest to crest and that the height of the crest of the waves above the 1262 trough was fully 3 feet. The normal ones ran from that height down to where we had nothing but the chop. They appeared to adhere to one section of the river, and to occur in cycles, the cycles taking from 15 to perhaps 45 minutes. The sand waves must 1263 have moved down the river to some extent, but the motion down the river was not fast. In navigating these sand waves we turned the boat substantially into the trough, and simply the current carried us over wave after wave, with practically no rocking. If we could catch this formation of the smooth form I time so as to get the boat into position, there was practically no difficulty. Normally we got in the trough of the wave and simply floated down sideways with our power off. We had no difficulty in getting through. We 1264 would drift through at probably 3 or 4 miles an hour. the current is swift wherever there are sand waves. and I doubt if any set of sand waves occupy more than one- third of a mile in length of the river. From the mouth of the San Juan through Glen Canyon to the Utah- Arizona line I made notes of sand waves at several different 1265 places. I did not come up the river. From the Utah line down to Lees Ferry I have notes of sand waves at places and that completes my trip to Lees Ferry. 1266 On that stretch of the river I met one prospector at Red Canyon, mile 150. I saw no other boats going up or down stream except this prospector had a skiff about 12 feet in length and he |