The West Side Ditch diverts water from the Upper Clark Fork near Deer Lodge and conveys it more than 12 miles to Grant-Kohrs. But a huge swath of the Upper Clark Fork — 62.8 miles — is designated as critical habitat for bull trout by the U.S. In 1998, bull trout were listed under the Endangered Species Act, and in 2010, Fish and Wildlife Services established critical habitat units for the species, including the Clark Fork near Grant-Kohrs. “In most years, the West Side Ditch takes 50% or more of the Upper Clark Fork flow in mid-to-late summer. “Considering the Clark Fork River was a healthy river full of bull trout when the original Grant-Kohrs Ranch was founded in 1862, the question is whether the Park Service should destroy bull trout critical habitat for a historic ranch display when simply growing less hay can help return the Clark Fork to a living river where bull trout can once again survive, spawn, and avoid extinction.”