[word=moderately] □
[word=moderately] [□]
[word=moderately] □*
On their return from the Pacific Ocean in May of 1806 , the Corps of Discovery entered the foothills of the Blue Mountains , a region of moderately steep rolling hills , cut by creek valleys , near an ancient American Indian trail . The 10-kilometer-long , moderately steep trail is marked above tree line by red circles painted on rocks .