The trail is named after a large Hydra-like tree along its way. It's not too technical and the trail is largely smooth riding. It features several short bridges across drainages, rooty, sidehill sections, and a few rock features. Most fun as a downhill from Bear Claw to the Access Road; usually used as an uphill to get from the bottom of the machine built flow trail "Shock Therapy" to the top trails to complete a loop or take another lap on Shock Therapy.
When riding fast on the access road, the entrance to this trail can come up fast, so keep watching for the trail marker. After exiting Shock Therapy turn left on the Access Road and in about 300' Hydra goes right. If you take it downhill from Bearclaw you'll end up at the bottom of everything, leaving you 2 choices: turn around and go back up Hydra, or turn right and slog up the steepish and rocky Access Road. Uphill on Shock Therapy is not recommended.