This is a multi-use trail made of crushed gravel. There are no technical features at all, but it is good for a lunchtime lap or for a couple of laps after work. It's also good for taking small kids riding on to get them onto a dirt trail that won't freak them out.
As a loop it's about 2.7 miles, 3.9 if you ride out to each of the two overlooks, and it can be ridden in either direction.
Official Douglas County trail map is here:
http://www.douglas.co.us/dcoutdoors/documents/bluffs-regional-park-and-trail-information-and-map.pdf
From I-25 take Lincoln Ave east about one block to Ridgegate Parkway, take that south about 1/2 mile to the trailhead
http://www.singletracks.com/item.php?c=1&i=3157