Emmett sits in a climate the federal data classifies as severe cold, and steel panels built in the late 1970s and 1980s mostly weren't insulated the way panels are today - a lot of these are single-skin steel with no foam backing. Steel that thin gets brittle in hard cold, and a stray basketball hit or a bumper tap that would just dent a newer insulated panel can crack or buckle an older uninsulated one at the rib.
The other factor is age itself. A door going up in 1977 has had over four decades of freeze-thaw cycling at the bottom section, where moisture sits against the steel the longest. We see bottom panels rust through from the inside - the paint looks fine on the face, but the inside skin is pitted and weak. That's not a defect in the install; it's just what four decades of cold winters does to unprotected steel at ground level.
Income in the surrounding service area runs a median around $75,270, but Emmett itself runs lower, closer to $58,523 - which is worth mentioning because it changes the repair-versus-replace math. Replacing a couple of worn sections on an otherwise sound door is often the right call here rather than defaulting to a full door swap.