Iowa Army Ammunition Plant Restricted Access Trail

The Iowa Army Ammunition Plant’s 19,000 acres harbor some of the state’s best remaining native prairie and oak savanna, accessible only through guided tours on old military service roads. Built in 1941 for World War II munitions production, the facility’s bunkers and rail spurs still dot the landscape among restored wetlands and grasslands. The main loop passes the original ordnance testing range where unexploded ordnance occasionally surfaces — hence the strict access controls.

Easy to moderate difficulty on maintained gravel roads, though some two-tracks require high clearance during wet periods. Any capable vehicle works for the main routes. Access strictly by appointment through scheduled tours — no independent exploration allowed due to legacy contamination concerns. Spring and fall offer best wildlife viewing when migratory birds use the restored wetlands. Fascinating glimpse of Iowa’s industrial war effort and subsequent environmental restoration.