Geography Colorado River Geographers Can Tell You That The One Thing That Most Rivers And Their Adjacent Flood Plains In The
Geography Colorado River Geographers can tell you that the one thing that most rivers and their adjacent flood plains in the world have in common is that they have rich histories associated with human settlement and development. This especially true in arid regions which are very dependent upon water. Two excellent examples are the Nile and the Tigris-Euphrates rivers which show use the relationship between rivers and concentrations of people. However, the Colorado River is not such a good example along most segments of its course. There is no continuous transportation system that parallels the rivers course, and settlements are clustered. The rugged terrain and entrenched river channels are the major reasons for sparse human settlement.
We ask ourselves, did the Colorado River help or hinder settlement in the Western United States? As settlers began to move westward, the Southwest was considered to be a place to avoid. Few considered it a place to traverse, to spread Christianity, and a possible source of furs or mineral wealth. Finding a reliable or accessible water source, and timber for building was difficult to find. There was a lack of land that could be irrigated easily. By the turn of the century, most present day cities and towns were already established.
Trails, roads, and railroads linked several areas with neighboring regions. Although the Colorado River drainage system was still not integrated. In the mid 1900s many dams had been built to harness and use the water. A new phase of development occurred at the end of the second World War. There was a large emphasis on recreation, tourism, and environmental preservation. The terrain of the Colorado River is very unique.
It consists of Wet Upper Slopes, Irregular Transition Plains and Hills, Deep Canyonlands, and the Dry Lower Plains. Wet Upper Slopes: Consist of numerous streams that feed into the Colorado River from stream cut canyons, small flat floored valleys often occupied by alpine lakes and adjacent steep walled mountain peaks. These areas are heavily forested and contain swiftly flowing streams, rapids, and waterfalls. These areas have little commercial value except as watershed, wildlife habitat, forest land, and destinations for hikers, fishermen, and mountaineers. Irregular Transition Plains and Hills: These areas are favorable for traditional economic development. It consists of river valleys with adequate flat land to support farms and ranches. Due to the rolling hills, low plateaus, and mountain slopes, livestock grazing is common. The largest cities of the whole drainage system are found here.
Deep Canyonlands: Definitely the most spectacular and least developed area along the Colorado River. These deep gorges are primarily covered by horizontal layers of sedimentary rocks, of which sand stone is the most abundant. The Grand Canyon does not only display spectacular beauty, but numerous other features such as mesas, buttes, spires, balancing rocks, natural arches and bridges, sand dunes, massive sandstone walls, and pottholed cliffs. Dry Lower Plains: These consist of the arid desert areas. These areas encounter hot summers and mild winters. Early settlement was limited because most of the land next to the river was not well suited for irrigation agriculture.
The area is characterized by limited flat land, poor soils, poor drainage, and too hot of conditions for most traditional crops. The Colorado River was first navigated by John Wesley Powell, in his 1869 exploration through the Marble and Grand Canyons. The Colorado River begins high in the Colorado Rocky Mountains. The water begins from melting snow and rain, and is then supplemented by the Gunnison, Green, San Juan, Little Colorado, Virgin, and Gila Rivers. Before any dams were built, the Colorado River carried 380,000 million tons of silt to the Sea of Cortez. Along its path, it carves out the Marble, Grand, Black, Boulder, and Topok Canyons.
The Grand Canyon being the most popular, which is visited by numerous tourists every year, plays a large role in western tourism. The Grand Canyon is in fact one of the Worlds Seven Wonders. The Colorado Basin covers 240,000 square miles of drainage area. At certain points along the river, it turns into a raging, muddy, rapid covered mass of water. Unlike other rivers, the Colorado River doesnt meet the ocean in a grand way, but rather in a small trickle. Almost all of the water that passes down the river is spoken for.
It passes through seven Western States, travels 1,700 miles, and descends more than 14,000 feet before emptying into the sea, with more silt and salinity than any river in North America. A river not used for commerce, or any degree of navigation other than recreational, and virtually ignored until the turn of the century. The Colorado River is the most fought over, litigated, and legislated river in the United States. The upper Colorado passes through mountainous, less populated country. It has seen fewer problems that the lower Colorado.
The lower Colorado, which passes through canyons and arid desert, serves a more populated area. It has been a large source of arguments for the state of California and surrounding areas since the early 1900s. The first project on the Colorado River was the Alamo River Project near Yuma, Arizona. Sediment from the upper river was transported and deposited down river. It raised the river bed so the river was higher than the surrounding land, making water easy to divert for irrigation. The Alamo Canal diverted water from the Colorado River to the Alamo River, and traveled 60 miles through Mexico across the Mexicali desert to the Salton Sink, a depression in the Imperial Valley.
For this, Mexico received the right to take half the water from the canal, the rest went to the Imperial Valley. Although it may have seemed like an easy way to divert the water, the Alamo Canal was no match for the untamed Colorado River. In 1905 a series of floods breached the intake and flooded the Imperial Valley, settling in the Salton Sea. After tremendous amounts of manpower and money, the river was returned to its original path. This disaster alarmed the landowners of the valley.
The Imperial Irrigation District of Southern California was the largest single user of Colorado River water. They campaigned for an All-American Canal. One that would divert the river above the Mexican border and leave the Mexicali desert with what they didn’t use. This was met with much opposition from the largest landowner in the Mexican desert, a syndicate of wealthy Los Angeles businessmen, headed by Harry Chandler of the Los Angeles Times. The Imperial Valley landowners received support from the City of Los Angeles.
The city was growing rapidly and the need for future electric power was a major concern. Water experts advocated a dam on the Colorado. Without this dam, the All-American Canal would be in danger of breaching and flooding. The two forces combined to work for a Dam in Boulder Canyon on the Colorado River. In Salt Lake City in January 1919, representatives from the seven states that have tributaries emptying into the Colorado River met.
“The water should first be captured and used while it is young, for then it can be recaptured as it returns from the performance of its duties and thus be used over and over again “.(1) On Nov. 24, 1922, the seven states signed the Colorado River Compact. This pact divided the waters into 2 basin areas, separated at Lee’s Ferry, at the head of the Grand Canyon. The Upper states included Colorado, New Mexico, Utah and Wyoming. The Lower states included Arizona, California and Nevada.
Each area received 7.5 million acre feet of water, with the lower basin getting an extra 1 million acre feet annually from its tributaries. The allocation of river water was based on an annual flow at Lee’s Ferry of 16.5 million acre feet. This was later found to be inaccurate and did not take into account the rivers dry years. A more accurate flow is 13.5 million acre feet per year. In addition, any water given to Mexico by international treaty would be supplied first from the surplus above the total of 16 million acre feet, and if this was not sufficient, the deficiency would be shared equally by the two basins.
The consensus was that the river and its tributaries were American (244,000 sq. miles) originating in the United States, very little of the Colorado River was in Mexico (2,000 sq. miles), and therefore they deserved very little. Herbert Hoover stated, “We do not believe they (Mexicans) ever had any rights.” The Indian tribes along the river were treated the same way. Hoover inserted what was called the ‘Wild Indian Article’, “nothing in this compact shall be construed as affecting the obligations of the United States of America to Indian tribes.” (2) Its obvious that the native Mexicans and Indians were being deprived of what originally belonged to them. The attitude of Herbert Hoover left the local peoples with a taste of resentment.
The Colorado River Pact did not apportion water to individual states. Arizona would not ratify the pact, feeling that California was taking all the water given to the lower basin. Arizona contributed 3 major rivers, about 2 to 3 million acre feet, to the Colorado. California farmers would be the largest single users of the water, but would contribute nothing. California finally agreed to some concessions.
All the waters of the Gila River in Arizona would go to Arizona, and be exempted from the Mexican Treaty. California also agreed to apportion 0.3 million acre feet of water to Nevada, 4.4 million acre feet and 1/2 of the surplus to California, 2.8 million acre feet to Arizona and the other 1/2 of the surplus. Arizona was still not satisfied. The argument went on for years, with Congress finally passing the Boulder Canyon Act in 1928 without Arizona’s ratification. The Boulder Canyon Act of 1928 authorized the construction of a hydro-electric plant at Black Canyon. The cost to be off-set by the selling of electric power over a total of 50 years.
All power privileges at the dam were to be controlled by private interest. The Metropolitan Water District controlled 36%, City of LA 19%, Arizona 18%, and Nevada 18%. The act also included the construction of the All-American Canal, starting at Laguna Dam and crossing 75 miles of Imperial Valley to the Salton Sea. Arizonas share of the water made it possible for large population increases in Phoenix and Tucson, two desert regions that would not be able to exist with out the Colorado River. Population increases in Phoenix and Tucson were using much of the state’s water. Arizona wanted more water from the Colorado River, they continued to fight California for it.
In 1930 Arizona filed what was to be many lawsuits against the State of California for more water rights. It wasn’t until Arizona was granted electricity from Hoover Dam, and given assurances for the Central Arizona Project, that Arizona ratified the 1922 Colorado River Compact, 22 years later. Nevada, the one state that has no major river, was largely unpopulated at this time and remained unconcerned about the water allocation. During this time, The Federal Bureau of Reclamation built Davis Dam, 66 miles below Hoover Dam to further regulate flows and provide storage. Parker Dam, below Davis was built in 1934 to facilitate the 242 mile long Colorado River Aqueduct.
This was another of Metropolitan Water District’s projects to transport water to Los Angeles. With Hoover and Parker, California could receive 5.6 million acre feet from the Colorado River. Mexico saw its share of the river water drying up with the control of the water at Hoover Dam. In 1944 the United States, wanting to continue a good relationship with her neighbor, signed an agreement with Mexico giving them 1.5 million acre feet per year, with nothing said about the quality of the water. Mexico water, due to return irrigation water from United States fields and evaporation was increasingly saline. Additional water to flush the salts was tried, but the condition worsened.
By 1955, the Mexicali Valley was a leading cotton producing region. By 1960, growing salinity of river water hurt the cotton crop along with the decline in cotton prices. Mexico and the United States argued over the quality of water, and due to the administration’s “Good Neighbor Policy”, the United States acquiesced, and in 1973 signed a water agreement with Mexico. United States reduced salt by releasing more water upstream, the quality of water arriving at Morelos Dam was to be equal in quality to water behind Imperial Dam. The silt was to be removed by the giant desilting works at Imperial Dam, and then the water was returned to the river above Morelos Dam at the Imperial Irrigation District Pilot Knob power drop.
This policy promised Mexico that salinity levels would be no more than 115 parts per million. It also obligated the United States to assume all costs necessary to meet the salinity levels. As a result, the United States agreed to upstream salt control projects in Nevada, Utah, and Colorado, and a 260 Million dollar desalination plant in Yuma, Arizona. The desalination plant reclaims more than 70 million gallons of drainage water a day from the Welton-Mohawk irrigation project. Fifty miles from the Mexican border is Laguna Salada, the end of the Colorado River. An unlined canal carries the water 50 miles and then empties it onto the flat plain of sand and silt where the Sea of Cortez washes the last drops into the gulf. The Mexican water irrigates soil for 14,000 farmers and supplies drinking water for the Mexicali Valley.
A 76 mile aqueduct provides water for Tijuana, Mexico. It was not until 1964 that Arizona finally got their share of the water with the passage of the Central Arizona Project. The Central Arizona Project was the culmination of years of litigation. The 3.5 million dollar project pumps water from Lake Havasu, 824 feet up and over the Buckskin Mountains through a 7 mile tunnel along a concrete aqueduct 333 miles to the cities of Phoenix and Tucson. The Central Arizona Project was built by the Bureau of Reclamation and finished in 1991.
In 1963 in Arizona vs. California, the Supreme Court allocated 900,000 acre feet of Colorado River water to 5 Indian tribes along the river, and 79,000 acre feet for federal lands. This gives them sufficient water to meet needs of reservation. Recently the tribes have reasoned that farm lands were omitted from the original estimate and that they want more water rights. If tribes receive more water, this could mean less water for the lower basin. Opponents argue that the Navajo Tribe bargained away some rights for other developments, such as the huge coal burning power plant on Lak …