BOISE, Idaho -

 Idaho Rivers United and the Nez Perce Tribe are in mediation with the U.S. Forest Service to end a lawsuit concerning megaloads on U.S. Highway 12 in northern Idaho.

Kevin Lewis of Idaho Rivers United said Wednesday the groups are seeking to have the federal agency come up with specific rules concerning gigantic loads traveling on the northern Idaho route that includes a federally designated Wild and Scenic River corridor as well as tribal land.

The groups sued the Forest Service last year, and U.S. District Judge B. Lynn Winmill in September granted a preliminary injunction halting shipments.

His ruling required the Forest Service to conduct a corridor review, and the agency on Monday released a document attempting to assess impacts the giant loads have passing through the rugged area.