Location: US-16A and SD-87, Custer Cty Reassurance shield after the Highway 87 split Location: US-16A and Grace Coolidge Campground Rd, Custer Cty Reassurance shied after the Grace Coolidge Campground. Grace Coolidge was Calvin Coolidge’s wife Location: US-16A and Wildlife Loop Trail, Custer Cty Reassurance shield after some wildlife loop drive intersects Location: US-16A and SD-36, … Continue reading U.S. Route 16 Alternate, SD-87 to SD-36