Great interactive map lets you see the proposed route in detail:
https://gis.railstotrails.org/grtamerican/
Remember, Lewis and Clark pushed wagons and carts over these mountains in far more difficult circumstances. And they didn’t have carbon fiber or a c-store every 10 miles.
I am glad that you posted that... It is a much better route than what I imagined through this area. The difference is that they are starting further North on the Burke Gillman Trail and connecting to the Trail that goes through Carnation and eventually becomes the John Wayne Trail using less traveled streets. If the route it took the southern Ferry that ends in West Seattle and took the Green River Trail into Renton and got on the Cedar River Trail and could go through the Seattle Watershed it would save 30 to 40 miles, avoid the mess in downtown Seattle and avoid lot of steep climbs on local streets and on the way up to Rattle Snake Lake.... It will never happen because Seattle officials pay lip service only to this type of thing.
“Remember, Lewis and Clark pushed wagons and carts over these mountains in far more difficult circumstances”
Lewis and Clark didn’t use carts or wagons. They traveled in a flatboat up the Missouri then used canoes, walked or rode horses for the rest of the trip to the Pacific and back.