KELLOGG, Minn. — Through the end of August the Army Corps has closed the West Newton Chute boat landing on the Mississippi River. The Corps is dredging accumulated river-bottom sediment out of the main navigation channel. The sediment, above Fisher Island, is being transported to the upland Rolling Prairie dump site on the other side of Kellogg.  Although the landing is closed, boating is allowed. Be advised, however, that large towboats and barges will be in the vicinity. Use extreme caution and wear life jackets, the Corps said.