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)                                                                                      

4c.  Cascade Crest             2219 High, undulating, volcanic plateau punctuated  4000-6500 Pleistocene-Pliocene basaltic and andesitic                            Spodosols (Haplocryods,                  Lastance, Talapus, Thader, Mt. Hood,                Cryic/           55-100 30-90                         21/35;
                                                                                                                                                                                                                                                                                                                                        Mountain hemlock, Pacific silver fir;          Forests composed of mountain hemlock, Pacific
                                           by buttes and cones. Sinuous, medium                     /          lava flows, breccia, pyroclastic deposits;           Humicryods), Andisols                    Dinzer, Vanson, Sinnice, Tradedollar.                Udic                                                 43/72            some grand fir, noble fir.                     silver fir, Englemann spruce, and lodgepole
      Montane Forest                                                                                                                                                                                                                                                                                                                                                                                                      
                                           gradient streams flow through the glaciated        500-2500         some Pleistocene alpine glacial deposits.            (Fulvicryands), Inceptisols              Very gravelly silt loam, stony fine                                                                                                                                       pine are extensive. Land uses include back-
                                           landscape. Numerous glacial rock basin lakes.                                                                            (Cryandepts)                             sandy loam, sandy loam, very cobbly                                                                                                                                       country recreation and some forestry.
                                           Small lakes on collapsed lava flows. Wetland                                                                                                                      loam.                                                                                                                                                                     Ecoregion 4c is an important regional water
                                           areas are found in southwestern Washington                                                                                                                                                                                                                                                                                                  source.                            
                                           Cascades.