The Cienega de Santa Clara is one of the most important wetlands for birds on the Pacific Flyway. The natural area accidentally came into existence after the finishing of the drainage canal from the Welton Mohawk irrigation district in Arizona..The builders never continued the drain all the way to the coast, leaving the water with a high salinity level to settle on a mudflat a few dozen miles from the Sea of Cortez. ..The Colorado River delta has hardly seen any Colorado water in the past 30 years. The 1.5 million acre feet of water that the USA delivers across the border into Mexico is completely used by cities like Tijuana and Mexicali. The majority, though goes into the irrigation of the vast agricultural area that covers the northern part of the delta. The line of agricultural fields slowly moves northwards though due to an increasing salinity of the area.