A bland winter day. This loop is about 8 miles from the furnace, then to the Furnace Arch, and then the gravel road back to the hardtop. A map makes it simple, plus you get a chance to bush-whack up to Gate Post Hill and *hump* the impressive arch....andA bland winter day. This loop is about 8 miles from the furnace, then to the Furnace Arch, and then the gravel road back to the hardtop. A map makes it simple, plus you get a chance to bush-whack up to Gate Post Hill and *hump* the impressive arch....and then visit the popular Clear Creek shooting range.