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<br />, <br />. <br />1: <br />.~ <br /> <br />~ <br /> <br />:j <br /> <br />" <br />.: <br /> <br />TABLE 2 (continued) <br />River Trips Throuqh Grand Canyon in 1971 <br /> <br />Commercial Operations <br /> <br />Grand Canyon Dories <br />Grand Canyon Expeditions <br />Grand Canyon Youth Expeditions <br />Harris Boat Trips <br />Hatch River Expeditions Co., Inc. <br />Moki Mac River Expeditions <br />Outdoors Unlimited <br />Sanderson Brothers Expeditions <br />Tour West <br />Western River Expeditions <br />White Water Expeditions <br />Wonderland Expeditions <br />Subtotal <br /> <br />National Park Service <br />Private Parties <br /> <br />" <br />,." <br /> <br />Trips <br /> <br />Travelers Visitor Days <br />195 2,265 <br />1,384 8,345 <br />52 714 <br />16 481 <br />1,811 11 ,030 <br />45 290 <br />6 72 <br />1,468 10,385 <br />700 3,446 <br />1,442 7,953 <br />420 2,453 <br />57 483 <br />10,345 66,001 <br />57 531 <br />434 5,427 <br />491 5,958 <br />10,836 71,959 <br /> <br />, <br />! <br />, <br />1" <br /> <br />4 <br />41 <br />4 <br />4 <br />56 <br />3 <br />1 <br />42 <br />25 <br />56 <br />17 <br />--..i <br />386 <br /> <br />20 <br />---H <br />54 <br /> <br />" <br />r. <br />" <br /> <br />i: <br />.' <br />%. <br /> <br />';. <br />~. <br />" <br />:~.... <br /> <br />i:.: <br /> <br />c:s' <br /> <br />:.... <br />>,' <br />;,;. <br /> <br />Grand Total 440 <br /> <br />The spread of river travel over a prolonged season makes possible <br />the accomodation of such large numbers of river travelers in the narrow con- <br />fines of the canyon walls, where only occasional sand bars provide the sites <br />necessary for overnight stops. With the cooperation of the commercial opera- <br />tors, sanitation imposes no particular problem. The operators haul out their <br />own garbage and provide chemical type toilets which process human waste to <br />the extent it can be safely filtered into the sand bar at the site. Firewood is <br />becoming scarce, since it is not being replaced by debris formerly brought in <br />from the upper reaches of the watershed, and eventually the use of artificial <br />fuel will be necessary in the camp areas. <br /> <br />~~~i <br /> <br />:<;. <br /> <br />~~ <br />~'. <br />~, <br /> <br />.,. <br />,. <br />~,j <br />:~.' <br /> <br />.. <br />:', <br /> <br />~! <br />tt <br />k' <br />~:1 <br /> <br />The National Park Service envisions a perpetual continuance of the <br />river travel activity at about its present level with no further change in <br />environment. Such is being made possible by Glen Canyon Dam through <br />river regulation. <br /> <br />,.j <br /> <br />COOL CLEAR WATER <br /> <br />With the closure of Glen Canyon Dam in 1963, the Colorado River <br />began dropping its sediment load in Lake Powell, where capacity was pro- <br />vided for such deposition. As a reult, the useful life of Lake Mead is <br /> <br />8 <br />