You mentioned that Mt. Jefferson is in the Continental Mountains but I think it's actually the Centennial Mountains on the Continental Divide. I don't know of a range called the Continental Mountains.
Oops. I guess I got typing and thinking too fast. Good to know people actually read submissions. Thanks for pointing that out.
So I decided to climb / hike to Mount Jefferson based on this website. The entry point to the trail is a road off of route 20 just like the website says. The trail head is also roughly 9.8 miles from route 20 just like the website says ( this road is the service road for the radio tower on the adjacent mountain ). The trail is roughly 5 miles to Lake Marie - and like the website says it's not that bad and really pretty. From the trail head to the lake + lunch you are looking at 3 hours. You basically are following trail 165 sign posts. Then comes Mount Jefferson. From Lake Marie to Mount Jefferson is a freakin death climb from hell. There is no way that a normal Joe can climb this mountain from the lake. You will need several hours, gallons of water and a new pair of legs. Outside of the fact that you will never get to the summit, the hike from the road to the lake then up the mountain as far as you can go it really pretty. If you are relatively in shape and have visions of grandeur of climbing this beast don't be disappointed if at some point you realize the journey is hopeless and beyond your reach. The hike is really nice, but the mountain will kill you.