Deer's Mill covered bridge Heather and I went back to my home turf in Indiana this past fall. When I take here there, I always have a list of things that I feel she needs to see...so she can better understand who I am. Covered bridges are all over the place back there...but you just don't see them in Colorado. Deer's Mill bridge was built in 1878 and spans 275 ft. across Sugar Creek near Crawfordsville, IN.