Location: US-16A and SD-36, Custer Cty Reassurance shield after the 36 turn. We’ll head over this giant mountain and down into Keystone Location: US-16A at the Custer County Line, Pennington Cty Reassurance shield as we head into Pennington County Location: US-16A and Spokane Rd, Pennington Cty Reassurance shield as we near the top of the … Continue reading U.S. Route 16 Alternate, SD-36 to SD-244