Spearfish South Dakota to Custer

East on I 90 to 385 south through Deadwood, Hill City is easiest. Spearfish Canyon on us 85 is a must see, but the upper canyon to 85 junction with us 14 above Savoy to Cheyenne Crossing is narrow, no shoulders. You can pull through safely, but cant use the pull outs to enjoy the scenery. See the canyon from your TV / towed.
Ask your camp host in Spearfish for local insider info about the sights in the canyon. Spearfish Falls ( the best! ) are not marked, only locals know how to see them.