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Improved irrigation water management (IWM) in 22.2 million hectares of irrigated U.S. farmland can play a role to conserve water, prevent pollution, and enhance crop production. Our objectives were to develop and evaluate a scalable device-independent mobile IWM system for Colorado and promote adoption by irrigators. A prototype IWM system with input from crop producers, researchers, and conservation and commodity representatives was developed for Colorado, accessible through the Internet. The tool is hosted on the collaborative environmental Risk Assessment and Management System (eRAMS) GIS with online modeling services on the Cloud Services Innovation Platform. The tool gives irrigators near-real-time estimates of daily soil water deficit (D c) of fields as an aid to schedule irrigations. It accesses weather data from several Colorado networks, providing daily rainfall and reference evapotranspiration (ETr) at 84 locations. Apps for handheld devices display IWM information and synchronize with the eRAMS tool. The IWM system was used for three growing seasons (2010–2012) to calculate daily root zone D c for a sprinkler-irrigated corn field in Colorado. Daily calculated D c had relative errors ranging from 2 to 31% compared with measured daily D c. The average RMSE was 16 mm of water, an acceptable amount as it could be compensated by a single irrigation event. Accuracy of calculated D c can be improved if midseason corrections based on measured profile soil water content are made. The IWM system was demonstrated at workshops across Colorado and adoption will lead to increased irrigation application efficiencies and improved water quality.