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<br />. <br /> <br />I <br />, <br /> <br />were built with government subsidies simply to add glarnour to real estate developments. It even _ <br />happened in Yosemite where park officials added a dam at Mirror Lake to raise the water level, ., <br />thereby "enhancing" the reflection of Half Dome for visitors. <br /> <br />In this century, darn building was transformed from local project into national enterprise. Edison <br />and Steinmetz started it with electric lights and long distance transmission. Water power <br />transformed into electricity could be sent instantaneously to every community in the country. <br />Hydro darns becarne cash registers overflowing with money to finance ever larger projects. It <br />rernained only for Franklin D. Roosevelt and the WP A to build dams on the scale ofthe pharaohs <br />- first came Bonneyille Dam and Grand Coulee Dam on the Columbia, then the Tennessee <br />Valley Authority, then Shasta Dam on the Sacramento. Dam building became an unstoppable, <br />runaway political juggernaut of spending, job creation and local pride. <br /> <br />As the juggernaut rolled on we paid a steadily accumulating price for these projects in the form <br />offish runs destroyed, downstream rivers altered by changes in temperature, wedges of sediment <br />piling up behind structures, downstream erosion and delta wetlands degraded by lack of fresh <br />water and saltwater intrusion. The great salmon runs of the Columbia River and the Snake drifted <br />toward extinction. The Colorado River ran dry, its great delta, celebrated in the writings of Aldo <br />Leopold, reduced to barren salt flats. The Platte River, once "a mile wide and an inch deep," <br />shriveled, threatening the existence of the vast migratory flocks of sandhill cranes. <br /> <br />For decades darn building remained unstoppable. Even John Muir at the height of his powers was <br />unable to stop the City of San Francisco from invading Yosemite National Park to construct the <br />Hetch Hetchy Dam. Then in 1956 the dam builders selected a site within the National Park <br />System, Dinosaur National Monument on the Colorado River. This time the opponents mounted ... <br />a national carnpaign and won. But their victory came at a heavy price - as a tradeoff the dam was ., <br />relocated outside the park, on a little known stretch ofthe Colorado River called Glen Canyon. <br /> <br />In 1963, as the darn gates closed and the river backed up and inundated hundreds of miles of <br />river and canyon, we came to understand that the issue involved more than just keeping dams out <br />of national parks and lamenting the loss of nice scenery. At stake was the integrity and life of the <br />river system itself. <br /> <br />I began to reflect on these issues over the course of many days and nights spent in the Grand <br />Canyon over the last half century. I hiked and boated and carnped beside the Colorado River <br />before Glen Canyon was built in the 1960s. In those years the Colorado river was a wild, <br />unpredictable, red-brown, sediment-laden torrent, "too thick to drink, too thin to plow," flooding <br />in the spring, languishing in the summer, always reflecting the seasonal weather across its vast <br />Rocky Mountain watershed. <br /> <br />When the gates of Glen Canyon Dam, a few miles upstream from Grand Canyon, closed in 1963, <br />we started to notice the downstream changes. The warm silt laden waters turnedjello green and <br />cold. In the depths of the Grand Canyon the waters rose and fell on a daily cycle, in response to <br />the heating and air conditioning demands in Phoenix and Los Angeles. <br /> <br />Over time, as I floated down the river, I saw trees high on the talus slope wither and die for lack <br />of water from seasonal flooding. I saw sandbars, once covered with arrowweed, willow and <br />cottonwood, disappear as the silt free waters scoured the banks down to granite boulders. I saw <br />the once plentiful native fish - unlike those anywhere on earth - driven back into a few isolated <br />tributaries, threatened with extinction. e <br />