The company headquarters was nominally based in Mexico, but its real headquarters was in Los Angeles, California.  This figure has been heavily affected by upstream diversions and reservoir evaporation, especially after the completion of the Colorado River Storage Project in the 1970s. Navigation along the river is hindered by the presence of natural and artificial obstacles such as waterfalls and dams, respectively. , Agricultural runoff containing pesticide residues has also been concentrated in the lower river in greater amounts. The West’s most famous river wasn’t born that way.  In 2011, the seven U.S. states agreed upon a "Plan of Implementation", which aims to reduce salinity by 644,000 short tons (584,000 t) per year by 2030. The environmental movement in the American Southwest has opposed the damming and diversion of the Colorado River system because of detrimental effects on the ecology and natural beauty of the river and its tributaries.  On the south, the watersheds of the Sonoyta, Concepción, and Yaqui rivers, all of which drain to the Gulf of California, border that of the Colorado. One reason Lee chose to run the ferry was to flee from Mormon leaders who held him responsible for the Mountain Meadows massacre, in which 120 emigrants in a wagon train were killed by a local militia disguised as Native Americans. , The Colorado River and its tributaries often nourish extensive corridors of riparian growth as they traverse the arid desert regions of the watershed.  A large estuary is formed here before the Colorado empties into the Gulf about 75 miles (120 km) south of Yuma. The Colorado River originates south of Lubbock, on the Llano Estacado near Lamesa.It flows generally southeast out of the Llano Estacado and through the Texas Hill Country, then through several reservoirs including Lake J.B. Thomas, E.V.  Annual runoff volume has ranged from a high of 22.2 million acre feet (27.4 km3) in 1984 to a low of 3.8 million acre feet (4.7 km3) in 2002, although in most years only a small portion of this flow, if any, reaches the Gulf. , In Utah, the Colorado flows primarily through the "slickrock" country, which is characterized by its narrow canyons and unique "folds" created by the tilting of sedimentary rock layers along faults. The Hardy River provides most of the flow into the Colorado River Delta, a vast alluvial floodplain covering about 3,000 square miles (7,800 km2) of northwestern Mexico. Here, the climate becomes significantly drier than that in the Rocky Mountains, and the river becomes entrenched in progressively deeper gorges of bare rock, beginning with Ruby Canyon and then Westwater Canyon as it enters Utah, now once again heading southwest. Even though it was located along a major travel route, Lee's Ferry was very isolated, and there Lee and his family established the aptly named Lonely Dell Ranch.  An extensive system of irrigation canals was constructed on the Gila and Salt rivers, with various estimates of a total length ranging from 180 to 300 miles (290 to 480 km) and capable of irrigating 25,000 to 250,000 acres (10,000 to 101,000 ha). , The gradual influx of European and American explorers, fortune seekers and settlers into the region eventually led to conflicts that forced many Native Americans off their traditional lands. With those funds Johnson expected to provide the transportation for the expedition but was angry and disappointed when the commander of the expedition Lt. Joseph Christmas Ives rejected his offer of one of his steamboats. Starting in the 1860s, gold and silver strikes drew prospectors to parts of the upper Colorado River basin. Author of. 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