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.' -f,. tj,"\ v.') _ u '~, L. - DRAFT The Compact provides further that, if the United States recognized any rights by Mexico in the Colorado River, the water would be supplied from the waters which are surplus to the allocations made to the Upper and Lower Basins. If this is not sufficient, then the burden of fulfilling the shortages will be equally borne by the Upper and Lower Basin states. The Rio Grande, Colorado and Tijuana Treaty of 1954, between the United States and Mexico, guaranteed delivery of 1,500,000 acre-feet of water per year to Mexico from the Colorado River. Recent legislation, specifically Public Law 90-537 (Colorado River Basin Project Act), approved September 30, 1968, declared that the satis- faction of the water requirements from the Colorado River to Mexico constitutes a national obligation of any water augmentation project planned pursuant to the Act and authorized by the Congress. It relieves both the Upper ani! Lo'ver Basin from the compact requirement covering deliveri "s of water to Mexico. This relief is contingent upon the authorization and operation of a plan to augment the Colorado River water supplies by 2~ million acre-feet annually. B. ~ Colorado Riv~r Basin Com~~~ This compact between the states of Arizona, Colorado, Ne", Mexico, Utah and Wyoming and the United States Government apportions waters of the Upper Colorado River Basin which had been alloted to the Upper Basin states by the Colorado River Compact. Of the Upper Basin allocation, Arizona ",as allotted 50,000 acre-feet annually. The remaining states ",ere allocated the follo",ing percentar-es of the remainder: Colorado - 51.75%, Ne", Mexico - 11.25%, Utah - 23.00% and Wyoming - 14.00%. The state of Colorado agreed to deliver ",ater to New Mexico from the San Juan River and its tributaries in a sufficient quantity to enable New Mexico to make full use of its allotted share. 20.