AllTrails.com: A Useful Resource
We recommend that hikers subscribe to National Geographic’s AllTrails.com. There is a Free version and a PRO version for $29.95 in 2016.
The advantage of the PRO version is that you can print off maps and download them to your phone, for use online or offline use. The maps feature detailed USGS maps with several layers and trails well marked if you can read a contour map.