I recently purchased a map from the Missoula-based Adventure Cycling Association (https://www.adventurecycling.org) covering the Lewis & Clark Trail from Great Falls, MT to Clarkston, WA. It's the first half of my ambitious plan to cycle from Helena (or wherever) to Portland, Oregon, in the summer of 2017.
This evening I started to watch a few YouTube videos on cycle touring. The average of about 50 miles a day is in line with what I had imagined I might do next year. If I want to ride 700 miles, it'll take 14 days - definitely doable. To make it more "interesting" I want to ride it on a tandem, which will require one or more riding partners. My inclination is to think that it'll take place in September, after the blazing hot months of July and August, but before the snow and cold of October make conditions too unpleasant.
The Adventure Cycling Association is promoting June 3rd through 5th as "National Bike Travel Weekend", so I'm thinking that would be a good time for me to start - the week after I get back from my Crater Lake adventure! I wonder if my legs will be in fit condition to do it?