3.                           W I L L A M E T T E   V A L L E Y                                                                                                                                                                                                                                                                                                                                                            


      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)                                                                                      

3b.  Willamette River           675 Floodplains with low gradient, incised,                     40-500         Holocene and Pleistocene fluvial sediments. Mollisols (Haploxerolls,                          Cloquato, Newberg, Chehalis, Wapato,               Mesic/             40-50           165-210             33/46;           Cottonwood, alder, Oregon ash,                 Vegetable and fruit farming, pastureland,
                                           strongly meandering rivers and associated                /                                                               Endoaquolls), Vertisols                  Waldo, Bashaw. Very deep to deep,                   Xeric                                                 50/85            bigleaf maple, Douglas-fir.                    urban/suburban/rural residential development,
      and Tributaries                                                                                                                                                                                                                                                                                                                                                                                                     
                                           oxbow lakes/meander scars.                            10-80                                                              (Endoaquerts)                            fertile, silty clay loam to fine sandy                                                                                                                                    forested riparian areas, flood control.
      Gallery Forest