I'm afraid you're mistaken.
The link you posted is that of a private campground. "The Pipeline", as it is commonly referred to, is actually Forest Service Road #55552 on the Lakewood-Laona Ranger District located in the Eastern Chequamegon/Nicolet National Forest. You can find FS #55552
on their website.
The Wisconsin Off-Highway Vehicle Association (WOHVA)
held a Trail Maintenance Day there earlier this spring (May 15th, 2010). WOHVA also has a Fall Trail Maintenance Day scheduled for September 25th, 2010 (National Public Lands Day). Attending this event would be a great way to become familiar with the area.