ultimately decided that the Boulder Canyon Provision was correct for the lower states (which are California, Nevada, and Arizona). While the Court ultimately ruled in favor of Arizona, it agreed with California's interpretation that how it received surplus water supplies was correct. Future developments and issues Since the development of the Colorado River Compact, California has been using the surplus water that has been left over from other states. With increasing population growth in the Southwest there is concern that this surplus soon will not exist for California's use. In 2001, Secretary of the Interior Bruce Babbitt signed an interim agreement, determining how water surplus from the Colorado River will be allocated between the states, and creating a 15-year period to allow California time to put conservation methods in place to reduce the state's water usage and dependence on Colorado River water. There is also concern regarding Nevada's increasing population and the state's water usage. Nevada, with the smallest water allocation in the lower river basin, may find in the near future that the water supplied by the Colorado River will not meet the state's growing needs. In 2008 Southern Nevada Water Authority General Manager Pat Mulroy said that she does not support a water reallocation. This is because all of the states in the river basin have experienced growth she says that it is unlikely that Nevada's allocation would increase, and it could even decrease. Instead Nevada, like California, may have to work on conservation methods as well as finding other water sources to support the state's growing population. Development was the prime concern of the Colorado River Compact, when signed in 1922. Using and reusing the river water as well as frequent damming results in an unfavorable environment for native fish species. Dams block fish passage, reduce natural silt deposition along flood plains and in deltas, and change water temperaturesall negatively impacting the natural ecosystem. The high water usage has also caused the Colorado River Delta, located in Mexico, to significantly deteriorate. Once a lush and green area from the high amounts of silt deposit, the plentiful ecosystem has now all but disappeared. The Colorado River had been over allocated since the beginning of its time, as during the signing of the Colorado River Compact, the flows were vastly overestimated and much more generous than they should have been. It was originally estimated to have 17 million acre-feet