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)                                                                                      

4d. Cascades                    719 High, glaciated, volcanic peaks with                      5600-14410  Pleistocene basalt and andesite; some alpine  Entisols (Cryorthents)                               Bare rock, rubble.                                  Cryic/           75-140 0-30                          16/31;
                                                                                                                                                                                                                                                                                                                                        Herbaceous and shrubby subalpine               Bare rock, glaciers, subalpine meadows, and
                                           cascading streams, glacial cirques, and tarns.           /          glacial deposits.                                                                                                                                 Udic,                                                 38/65            meadow vegetation; scattered                   forests. Land uses include back-country
      Subalpine/Alpine                     Active snowfields and glaciers more common  1600-8000                                                                                                                                                                Peradic                                                                 mountain hemlock, subalpine fir                recreation. Ecoregion 4d is an important
                                           to the north. Active and dormant volcanoes.                                                                                                                                                                                                                                                  stands.                                        regional water source.