South of Lewiston in the Hells Canyon National Recreation Area, the Summit Ridge Trail (#1774) is an awesome 22 mile route worth checking out. It starts at at PO Saddle and ends at Warnock Corral.
To reach the hiking trailhead, take State Highway #350 from Joseph, OR. Drive approximately 8 miles, turn right on to Road #39 (Wallowa Mountain Loop Road) Go approximately 31.5 miles, turn left at Forest Road #3965 (Hells Canyon Overlook) which is a paved 2-lane road for approximately three miles and then continue past the Hells Canyon Overlook on a gravel road until you reach P.O. Saddle, approximately 7 miles from Hells Canyon Overlook.
Also, check out the Windy Ridge Trail (#1782).
Overall, Summit Ridge Trail is the 6th most popular hiking trail of all 21 hikes in Oregon.