The total elevation difference for this hiking and backpacking trail is 1,678 feet which is an average number. Now, this is roughly a 3-day backcountry hike, so make sure you've got all your overnight gear packed. This is a hiking and backpacking trail that is quite long, so don't forget to pack enough supplies. This great outdoors hiking trail goes through some very different elevations which of course means you need to be prepared for different conditions on different parts of the great outdoors hiking trail. Toutle River Trail is 19.4 miles long; it's longer than many great outdoors hiking trails. This is a one trailhead hiking and backpacking trail, so in and out is the way to trek it normally.