The Imperial Irrigation District has been using its clout as the agency with the biggest water entitlement along the Colorado River to press for California officials to live up to their commitment that they will keep the Salton Sea from turning into an environmental disaster. During the past year, IID has warned the state that without a credible, well-funded “road map” to restore deteriorating shoreline habitats and cover up growing stretches of dust-spewing lakebed, the district won’t take part in a proposed deal to use less water from the dwindling Colorado River.