Junction of highway # 385 & # 16 North to Deadwood City, South Dakota - Spearfish, South Dakota. South to city of Custer, SD. - For highway travel north and south via U.S. Highway # 385 - See Milebymile.com Road map Highway Travel Guide - U.S. highway # 385 - City of Custer SD. to city of Deadwood, SD; for driving directions. THE BLACK HILLS NATIONAL FOREST - Junction of Highway # 385 to Mount Rushmore National Monument Black Hills National Forest stretches for 1.2 million acres, offering outdoor adventure like hiking, biking and camping amidst stunning scenery. Find grassy mountain meadows, towering granite peaks, deep canyons, cascading trout streams and clear, clean lakes.