Old Missouri Trail 2 061019 A marker for a long-forgotten trail was dedicated in Sioux City’s War Eagle Park Sunday afternoon. The Old Missouri Trail Monument marks a Native American and fur trappers’ trail that was being used long before white people settled the area. The monument was first unveiled in May 1928 by the Martha Washington Chapter of the Daughters of the American Revolution. The DAR’s Elizabeth Rosenbaum said the boulder was identified last May after Sioux City Journal retired