There are several short rails in this system. Total it is about 5-6 miles of single track trail which ridden in different combinations can offer a few hours of fun. The terrain is very rocky and goes through boulder fields, and ponderosa pines. This is for the intermediate/advanced rider. Some of the trails in this system are Birketts, Jacobs Cliffs, Junction, Bouldering, Sailing Hawks, and Ponderosa. This trail system is located to the west of Animas mountain Trail, and there are trail connections to each other. Great in town ride! Dalla Mountain Park is located on the north west edge of Durango and offers some fantastic riding. The trails are little more technical and challenging but can also be enjoyed by the beginner rider. The terrain is rocky and some of the trails weave there way through some massive boulder fields where rock climbing enthusiasts can be found. <br />
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traveling north on Main Ave in Durango, CO turn left on 25th st. Drive past the middle school on the right take the second right which is Birket Dr. Park at the end of the road and see the sign for Dalla Mountain Park.
http://www.singletracks.com/item.php?c=1&i=4892