San Luis Obispo County is fighting a judge’s order to release more water from Lopez Lake, citing concerns that the plan would jeopardize the county’s drinking water supply. In December, U.S. District Court Judge Sherilyn Peace Garnett ordered the county to release more water from Lopez Dam to support steelhead trout migration through Arroyo Grande Creek. This plan must ensure that there is enough water in the creek to support steelhead trout traveling from the ocean to spawning habitat in the Arroyo Grande Creek Watershed, the judge said. The trout are designated as a threatened species by the Endangered Species Act.