Delta Cluster Professional Review and Guide
"The Delta Cluster is the farthest north of the CAMBA clusters and is by far the most widespread of all the trail networks. It was created by local trail activists who apparently got carried away and continued to push farther and farther out in their marking efforts until they created the massive expanse that exists today. The mountain biking found in this area is true north woods riding, covering a great deal of distance through rugged areas in vast wilderness. The loops in the Delta Cluster range from the small village of Delta north to the town of Iron River.
The area is served by four trailheads, with six trails in all found in the cluster. The riding varies from gravel roads in and around Delta to singletrack within the pine and hardwood forest. Just as the terrain is varied, so is the forest, with everything from dense, old-growth pine, to birch stands, to recently forested lands, to desolate, rolling hills, barren of trees and filled only with stumps. The entire trail network covers just over 100 miles all together and, as mentioned earlier, is therefore the most widespread of any of the six CAMBA clusters."