Many of the men employed in the Bonner mill over the years spent their evenings in the waters below the dam, fishing. And some of them left their lures tangled on the low-hanging line that stretched from the powerhouse to the far bank. The dam operators collected the lures; a bright row decorated the wall of the powerhouse workshop. Thousands of fish—including endangered bull trout—came up against the barrier of the dam every year in their aborted spawning migrations. Silvery bodies trapped in the hole below the dam sometimes shimmered as a solid mass. The dam offered easy pickings for the fishermen but not such a good deal for the fish. With the breach, these fish will once again spawn in the high, rocky creeks of the upper Clark Fork watershed. The migration has already begun. On April 9, researchers tracked a radio-tagged rainbow trout through the breach channel and up the Blackfoot River.