Harrison Ave entrance off I-40. Company Mill Trail starts at the NW end of the parking lot at the Harrison Ave entrance. It’s about a mile down the trail to the river and mill. There are significant rock formations to play on both sides of the river. The trail down/up is a nice ride with optional obstacles off-trail. This is a popular area, so expect traffic on the trail and people at the mill ruins – but it is totally worth it.. . Loblolly Trails starts at the NE corner of the same parking lot, and the description on the map is for that trail. Beyond the river noted in the description, the trail gets rugged and has optional rocky creekbeds and other obstacles.