I had this app called MountainBike that listed all the trails in the USA and was worthless. They just updated it and many of the local rides have maps of the trails (sals, jorden, bear creek, high rocks, etc) through a website Trailfu. The sals map looks sweet like one of euphoria's rides, other maps like High Rocks missed a lot of trails.
If you ride and GPS your ride you can add your trail map to mountainbike and trailfu.
Cant wait till my phone tells me on the trail to make a left at the y for the shortest ride back when lost 