Groups sue in defense of bull trout By SCOTT MABEN The Register-Guard Recommend this story to others. Four conservation groups are suing the federal government to stop old growth logging in the Willamette National Forest that they say will harm the bull trout, which is listed as threatened under the Endangered Species Act. The groups contend that construction of logging roads and the harvest of 200-year-old trees in the Middle Fork Ranger District would cause erosion that fouls streams to the detriment of bull trout in the upper reaches of the Middle Fork of the Willamette River. Cascade Resources...