A new report from Stanford’s Water in the West program assesses progress among states in the Colorado River Basin with respect to environmental water rights transfers, a legal tool that enables water rights holders to voluntarily transfer their water to rivers, streams and wetlands to benefit the environment and potentially generate revenue. The Colorado River provides water for more than 35 million people, supports numerous fish and wildlife species, including several threatened and endangered species, and irrigates more than 6,000 square miles of farmland. It also supports a variety of aquatic ecosystems from its headwaters in the Rocky Mountains to the deserts of the Southwest.