The Browns Creek Trail starts just down the road from the Browns Creek Trailhead, according to the map. <br />
The lower portion (1.2 miles) of the Browns Creek trail is horribly washed out and extremely rocky, filled with massive baby heads. I would advise against trying to ride up it, although it's rideable (except for one hike-a-bike portion) on the way down.<br />
The rest of the trail continues another 4.6 miles up into the mountains, past Browns Lake, and then it connects to a 4x4 road. Using the 4x4 road the Browns Creek trail can be looped with the nearby Little Browns Creek Trail.
Browns Creek Trailhead
http://www.singletracks.com/item.php?c=1&i=7675