<Tr> <Td> Nevada </Td> <Td> 4.00% </Td> <Td> 0.30 million acre ft / year (12 m3 / s) </Td> </Tr> <P> In addition to this, 1,500,000 - acre - foot (1.9 × 10 m) / year of Colorado River water is allocated to Mexico, pursuant to the treaty relating to the use of waters of the Colorado and Tijuana rivers and of the Rio Grande, signed February 3, 1944, and its supplementary protocol signed November 14, 1944 . Also, the lower basin can get an additional 1,100,000 - acre - foot (1.4 × 10 m) / year in surplus conditions . </P> <P> The compact was the fruit of several years of negotiations among the states . The seven states had previously formed the League of the Southwest in 1917 to promote development along the river . In 1921, Congress authorized the states to enter into a compact for allocation of the river resources . The agreement was approved by Congress in 1922, the same year it was signed . Colorado River Compact was signed by the delegates from the seven Colorado River Basin states: Wyoming, Colorado, Utah and New Mexico were designated Upper Basin states and California, Arizona and Nevada as the Lower Basin states . This compact determined that the water would be shared equally among the upper and lower basin states . Prior to the compact, the name of the river was standardized along its length . Previously the portion of the river upstream from its confluence with the Green River had been known locally as the "Grand River". The change was opposed by many local residents in Utah and Colorado, and the new name was enforced locally by acts of the state legislatures in both states in the early 1920s . One of the major concerns both today and back in the 1920s was the expanding population, and this increased the demand for water, particularly in California . In more recent years, mainly because of Las Vegas, Nevada has been looking for more use of the Colorado River . </P> <P> In 1934, Arizona, unhappy with California's decision to dam and divert the river, called out the National Guard and even commissioned a two boat "navy ." The matter was eventually settled in court . </P>

Who decides where the water from the colorado river goes