US FS ), ▁and ▁other ▁state ▁and ▁federal ▁ag encies . ▁The ▁new ▁classification ▁system ▁they ▁developed ▁may ▁differ ▁from ▁previous ▁frameworks ▁developed ▁separately ▁by ▁the ▁ag encies . ▁ ▁Oregon ▁is ▁e colog ically ▁diverse . ▁The ▁west ▁side ▁of ▁the ▁state ▁has ▁a ▁marine - infl uen ced ▁climate ▁and ▁receives ▁pl ent iful ▁precip itation ▁three ▁seasons ▁of ▁the ▁year . ▁In ▁contrast , ▁Eastern ▁Oregon ▁lies ▁in ▁the ▁rain ▁shadow ▁of ▁the ▁C asc ades ▁and ▁is ▁much ▁d rier . ▁The ▁clim atic ▁gradient ▁is ▁evident ▁in ▁the ▁state ' s ▁land sc apes : ▁for ested ▁mountains , ▁gla ci ated ▁pe aks , ▁shr ub - ▁and ▁grass - cover ed ▁pla ins , ▁agricult ural ▁valle ys , ▁be aches , ▁desert ▁play as , ▁and ▁wet lands . ▁ ▁Marine ▁West ▁Coast ▁Forest ▁▁ 1 ▁Coast ▁Range ▁ 1 a ▁Coast al ▁Low lands ▁ 1 b ▁Coast al ▁U pl ands ▁ 1 d ▁Vol can ics ▁ 1 f ▁W illa pa ▁Hills ▁ 1 g ▁Mid - Co ast al ▁Sed iment ary ▁ 1 h ▁Southern ▁Oregon ▁Coast al ▁Mountains ▁ 1 i ▁Red wood ▁Zone ▁▁ 3 ▁Will am ette ▁Valley ▁▁ 3 a ▁Port land / V ancouver ▁Bas in ▁ 3 b ▁Will am ette ▁River ▁and ▁Trib ut aries ▁Gallery ▁Forest ▁ 3 c ▁Pra irie ▁Terra ces ▁ 3 d ▁Valley ▁F ooth ills ▁ ▁North west ▁For ested ▁Mountains ▁▁ 4 ▁C asc ades