4.                            C A S C A D E S                                                                                                                                                                                                                                                                                                                                                                             

      Level IV Ecoregion                                   Physiography                                                              Geology                                                                          Soil                                                                        Climate                                            Potential Natural                         Land Use and Land Cover    
                                Area                                                           Elevation /                  Surficial material and bedrock                Order (Great Groups)                             Common Soil Series                Temperature  /     Precipitation     Frost Free      Mean Temperature                       Vegetation                                                       
                               (square                                                        Local Relief                                                                                                                                                  Moisture Regimes    Mean annual       Mean annual      January min/max;
                               miles)                                                             (feet)                                                                                                                                                                          (inches)            (days)      July min/max, ( F)                                                                                      

4a.  Western Cascades  6302 Westerly trending ridges and valleys with                          800-4000        Oligocene-Eocene andesitic, basaltic, and            Inceptisols (Haplumbrepts),              Klickitat, Kinney, McCully, Peavine,               Mesic/             60-90           120-180             31/41;           Western hemlock, western red cedar,            Douglas-fir/western hemlock/western red
                                           reservoirs and medium gradient rivers and                 /         rhyolitic lava flows and breccia.                    Ultisols (Haplohumults,                  Honeygrove, Orford, Olympic, Cinebar.                Udic                                                 47/78            Douglas-fir.                                   cedar/vine maple/red alder forests are wide-
      Lowlands and                                                                                                                                                                                                                                                                                                                                                                                                        
                                           streams. U-shaped, glaciated valleys in the         400-3000                                                             Palehumults), Andisols                   Very deep to deep, clay loam, silty clay                                                                                                                                  spread. Forestry and recreation are
      Valleys                                                                                                                                                                                                                                                                                                                                                                                                             
                                           east.                                                                                                                    (Haploxerands)                           loam, silt loam, gravelly clay loam,                                                                                                                                      important land uses and pastureland occurs in
                                                                                                                                                                                                             gravelly silt loam, cobbly loam.                                                                                                                                          lower valleys.