From the Agua Fria Trailhead off of 74, directly south of the Lake Pleasant Dam, start riding in a NE direction. This recently blazed trail meanders through some rough desert terrain and finally pops up onto the flats SE of the lake. It moves east until it intersects with the Black Canyon Trail.
The trail itself looks to have been created by someone with a Bobcat
and it's not so bad, it just needs more traffic on it to 'wear it in' a bit more. The trail connects with the Agua Fria Trail (don't know how that one is) to the south, and to the Black Canyon Trail (awesome) to the east and north.