Location: Custer St and 5th St, Custer Reassurance shield at the beginning of US-16A as  Highway 89 joins it through downtown Custer Location: Custer St and 9th St, Custer Reassurance shield as we head out of downtown Location: Mt Rushmore Rd and Sylvan Lake Rd, Custer As we head out of Custer, Highway 89 will … Continue reading South Dakota Highway 89, US-16/US-385/US-16A to US-16A