Steelhead salmon in the Columbia River face threats from warming waters and dams that interrupt their journeys home to spawn. Scientists analyzed 20 years of tracking data to understand how temperature and dam operations affect where these fish go during migration. They found that warmer temperatures make fish less likely to reach their home streams, but dam managers might be able to help by releasing water at strategic times. This research shows that fighting climate change will require both natural ecosystem recovery and smarter management of hydroelectric dams.