United States In cooperation with Soil Survey of Department of United States Department of Agriculture Agriculture, Forest Service; Benton County, United States Department of the Interior, Bureau of Land Management; Oregon State Oregon University, Agricultural Natural Experiment Station; and Resources Benton County Soil and Conservation Water Conservation District Service i How To Use This Soil Survey General Soil Map The general soil map, which is a color map, shows the survey area divided into groups of associated soils called general soil map units. This map is useful in planning the use and management of large areas. To find information about your area of interest, locate that area on the map, identify the name of the map unit in the area on the color-coded map legend, then refer to the section General Soil Map Units for a general description of the soils in your area. Detailed Soil Maps The detailed soil maps can be useful in planning the use and management of small areas. To find information about your area of interest, locate that area on the Index to Map Sheets. Note the number of the map sheet and turn to that sheet. Locate your area of interest on the map sheet. Note the map unit symbols that are in that area. Turn to the Contents, which lists the map units by symbol and name and shows the page where each map unit is described. The Contents shows which table has data on a specific land use for each detailed soil map unit. Also see the Contents for sections of this publication that may address your specific needs. National Cooperative Soil Survey This soil survey is a publication of the National Cooperative Soil Survey, a joint effort of the United States Department of Agriculture and other Federal agencies, State agencies including the Agricultural Experiment Stations, and local agencies. The Natural Resources Conservation Service (formerly the Soil Conservation Service) has leadership for the Federal part of the National Cooperative Soil Survey. This survey was made cooperatively by the Natural Resources Conservation Service and the United States Department of Agriculture, Forest Service; United States Department of the Interior, Bureau of Land Management ;Oregon State University, Agricultural Experiment Station; and Benton County Soil andW ater Conservation District. The survey is part of the technical assistance furnished to the Benton County Soil andW ater Conservation District. Major fieldwork for this soil survey was completed in 2003. Soil names and descriptions were approved in 2004. Unless otherwise indicated, statements in this publication refer to conditions in the survey area in 2004. The most current official data are available on the Internet. Soil maps in this survey may be copied without permission. Enlargement of these maps, however, could cause misunderstanding of the detail of mapping .If enlarged, maps do not show the small areas of contrasting soils that could have been shown at a larger scale. Since the publication of this survey, more information on soil properties may have been collected, new interpretations may have been developed, or existing interpretive criteria may have been modified. The most current soil inofrmation and interpretations for this survey are in the Field Office Technical Guide (FOTG) at the local field office of the Natural Resources Conservation Service. The soil maps in this publication are in digital form. The digitizing of the maps was completed in accordance with the Soil Survey Geographic (SSURGO) database standards. The digital SSURGO-certified maps are considered the official maps for the survey area and are part of the FOTG at the local field office of the Natural Resources Conservation Service. Nondiscrimination Statement The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual’s income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA’s TARGET Center at (202) 720-2600 (voice and TDD). To file a complaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice) or (202) 720- 6382 (TDD). USDA is an equal opportunity provider and employer. iii Cover Caption View of survey area looking west toward Marys Peak in distance. Christmas trees in foreground are on Santiam soils. Jory, Bellpine, and Gelderman soils are on Decker Ridge at left in distance and on low hills in areas of rural homesite development. Caterl, Laderly, Murtip, and Valsetz soils are dominant on the steep, east-facing slopes of Marys Peak, and Mulkey soils are in the open grassland areas on summit of peak. Additional information about the Nations’ natural resources is available online from the Natural Resources Conservation Service at http://www.nrcs.usda.gov. v Contents How To Use This Soil Survey.......................................................................................i Contents...................................................................................................................... v Foreword...................................................................................................................xiii General Nature of the Survey Area........................................................................... 2 History and Development......................................................................................... 2 Natural Resources ................................................................................................... 5 Physiography, Relief, and Drainage ......................................................................... 5 Biotic Systems ......................................................................................................... 7 Farming.................................................................................................................... 9 Forestland................................................................................................................ 9 Climate..................................................................................................................... 9 How This Survey Was Made ...................................................................................... 10 Survey Procedures ................................................................................................ 12 General Soil Map Units............................................................................................ 15 Soils on Flood Plains and Alluvial Fans in the Willamette Valley............................ 15 1. Chehalis-Newberg........................................................................................... 15 2. Waldo-Coburg, rare flooding-McAlpin.............................................................. 15 Soils on Flood Plains, Stream Terraces, and Alluvial Fans in the Alsea Valley and Other Tributary Stream Valleys in the Coast Range Mountains................ 16 3. Abiqua-Chehalis-Alsea, high precipitation....................................................... 16 4. Elsie-Nekoma-Meda........................................................................................ 17 Soils on Terraces in the Willamette Valley.............................................................. 18 5. Conser-Malabon-Coburg................................................................................. 18 6. Dayton............................................................................................................. 18 7. Woodburn-Willamette-Amity............................................................................ 18 8. Santiam ........................................................................................................... 19 Soils Derived from Sedimentary Rock on Hills in the Willamette Valley................. 20 9. Willakenzie-Dupee-Wellsdale.......................................................................... 20 10. Jory-Bellpine ................................................................................................. 21 Soils Derived from Igneous Rock on Hills in the Willamette Valley and on Foothills and Low Elevation Mountains in the Coast Range............................ 21 11. Dixonville-Gellatly-Witham............................................................................. 21 12. Jory-MacDunn-Price ..................................................................................... 21 Soils Derived from Sedimentary Rock on Low and Middle Elevation Mountains in the Coast Range.......................................................................................... 22 13. Apt-Honeygrove-Peavine............................................................................... 22 14. Preacher-Bohannon-Digger........................................................................... 22 Soils Derived from Igneous Rock on Low and Middle Elevation Mountains in the Coast Range.............................................................................................. 23 15. Honeygrove-Shivigny..................................................................................... 23 16. Hemcross-Klistan.......................................................................................... 23 Soils Derived from Sedimentary Rock on Middle and High Elevation Mountains in the Coast Range.......................................................................................... 23 17. Oldblue-Grassmountain-Chintimini................................................................ 24 vi Soil Survey of Soils Derived from Igneous Rock on Middle and High Elevation Mountains in the Coast Range.............................................................................................. 24 18. Laderly-Murtip-Caterl .................................................................................... 25 Detailed Soil Map Units ........................................................................................... 27 1—Abiqua silty clay loam, 0 to 3 percent slopes.................................................... 28 2—Abiqua silty clay loam, 3 to 5 percent slopes.................................................... 29 3—Abiqua silty clay loam, high precipitation, 0 to 3 percent slopes....................... 31 4—Abiqua silty clay loam, high precipitation, 3 to 5 percent slopes....................... 32 5—Abiqua silty clay loam, rarely flooded, 0 to 3 percent slopes............................ 33 6—Alsea loam, 0 to 5 percent slopes .................................................................... 34 7—Alsea loam, rarely flooded, 0 to 3 percent slopes............................................. 36 8—Amity silt loam, 0 to 3 percent slopes............................................................... 37 9—Apt-McDuff complex, 5 to 30 percent slopes.................................................... 38 10—Apt-McDuff complex, 30 to 50 percent slopes................................................ 40 11—Aquents, 0 to 3 percent slopes....................................................................... 43 12—Awbrig silty clay loam, 0 to 2 percent slopes.................................................. 44 13—Bashaw clay, 3 to 12 percent slopes .............................................................. 45 14—Bashaw clay, flooded, 0 to 3 percent slopes................................................... 46 15—Bashaw clay, nonflooded, 0 to 3 percent slopes............................................. 48 16—Bashaw silty clay loam, nonflooded, 0 to 3 percent slopes ............................ 49 17—Bellpine-Jory complex, 2 to 12 percent slopes............................................... 50 18—Bellpine-Jory complex, 12 to 20 percent slopes............................................. 52 19—Bellpine-Jory complex, 20 to 30 percent slopes............................................. 54 20—Bellpine-Jory complex, 30 to 60 percent slopes............................................. 56 21—Blachly-Kilowan complex, 5 to 30 percent slopes........................................... 57 22—Blachly-Kilowan complex, 30 to 60 percent slopes......................................... 59 23—Bohannon-Preacher complex, 30 to 60 percent slopes.................................. 61 24—Bohannon-Preacher complex, 60 to 90 percent slopes.................................. 63 25—Briedwell gravelly loam, 0 to 7 percent slopes................................................ 65 26—Briedwell gravelly loam, 7 to 20 percent slopes.............................................. 67 27—Burntwoods-Oldblue complex, 30 to 60 percent slopes ................................. 68 28—Camas gravelly sandy loam, 0 to 3 percent slopes........................................ 70 29—Camas gravelly sandy loam, relict bar, 0 to 3 percent slopes......................... 71 30—Caterl-Laderly-Romanose complex, 30 to 60 percent slopes......................... 72 31—Caterl-Laderly-Romanose complex, 60 to 90 percent slopes......................... 75 32—Caterl-Murtip-Giveout complex, 30 to 60 percent slopes ............................... 77 33—Caterl-Murtip-Laderly complex, 30 to 60 percent slopes................................ 80 34—Chapman loam, 0 to 3 percent slopes............................................................ 82 35—Chapman loam, high precipitation, 0 to 3 percent slopes............................... 84 36—Chehalem silty clay loam, 0 to 3 percent slopes............................................. 85 37—Chehalem silty clay loam, 3 to 12 percent slopes........................................... 86 38—Chehalis silt loam, 0 to 3 percent slopes........................................................ 87 39—Chehalis silt loam, high precipitation, 0 to 3 percent slopes........................... 89 40—Chehalis silty clay loam, 0 to 3 percent slopes............................................... 90 41—Chintimini-Blodgett complex, 60 to 90 percent slopes.................................... 91 42—Chintimini-Blodgett-Fiverivers complex, 30 to 60 percent slopes................... 93 43—Chintimini-Grassmountain complex, 5 to 30 percent slopes........................... 96 44—Chismore-Pyburn complex, 0 to 3 percent slopes.......................................... 98 45—Chismore-Pyburn complex, 3 to 12 percent slopes...................................... 100 46—Cloquato silt loam, 0 to 3 percent slopes...................................................... 102 47—Cloquato silt loam, high precipitation, 0 to 3 percent slopes......................... 104 48—Coburg complex, rarely and occasionally flooded, 0 to 3 percent slopes..... 106 49—Coburg silty clay loam, 0 to 3 percent slopes............................................... 107 50—Coburg silty clay loam, rarely flooded, 0 to 3 percent slopes ....................... 109 Benton County, Oregon vii 51—Concord silt loam, 0 to 2 percent slopes...................................................... 110 52—Conser silty clay loam, 0 to 3 percent slopes ............................................... 111 53—Dayton silt loam, 0 to 2 percent slopes......................................................... 113 54—Dayton silt loam, clay substratum, 0 to 2 percent slopes.............................. 114 55—Digger-Bohannon complex, 5 to 30 percent slopes...................................... 115 56—Digger-Remote-Umpcoos complex, 30 to 60 percent slopes....................... 117 57—Digger-Umpcoos-Remote complex, 60 to 90 percent slopes....................... 120 58—Dixonville-Gellatly complex, 12 to 30 percent slopes ................................... 122 59—Dixonville-Gellatly complex, 30 to 60 percent slopes ................................... 124 60—Dixonville-Gellatly-Witham complex, 2 to 12 percent slopes........................ 126 61—Dupee silt loam, 3 to 12 percent slopes ....................................................... 128 62—Dupee silt loam, 12 to 20 percent slopes ..................................................... 130 63—Elsie silt loam, 0 to 7 percent slopes............................................................ 131 64—Elsie silt loam, 7 to 15 percent slopes.......................................................... 132 65—Fiverivers-Grassmountain-Chintimini complex, 30 to 60 percent slopes...... 134 66—Fluvents-Fluvaquents complex, 0 to 2 percent slopes.................................. 136 67—Fluvents-Fluvaquents complex, high precipitation, 0 to 3 percent slopes..... 138 68—Formader-Hemcross complex, 3 to 35 percent slopes................................. 140 69—Formader-Hemcross complex, 35 to 60 percent slopes............................... 142 70—Formader-Klistan-Hemcross complex, 60 to 80 percent slopes................... 144 71—Gelderman-Jory complex, 2 to 12 percent slopes........................................ 147 72—Goodin-Dupee-Chehulpum complex, 2 to 12 percent slopes....................... 149 73—Goodin-Dupee-Chehulpum complex, 12 to 20 percent slopes..................... 151 74—Grassmountain-Fiverivers-Chintimini complex, 5 to 30 percent slopes........ 154 75—Harslow-Kilchis-Rock outcrop complex, 60 to 90 percent slopes................. 157 76—Harslow-Klistan-Rock outcrop complex, 60 to 90 percent slopes................. 159 77—Hazelair silty clay loam, 2 to 12 percent slopes............................................ 161 78—Hazelair silty clay loam, 12 to 20 percent slopes.......................................... 162 79—Hazelair silty clay loam, 20 to 30 percent slopes.......................................... 164 80—Hazelair silty clay loam, 7 to 20 percent slopes............................................ 165 81—Helmick silt loam, 3 to 12 percent slopes..................................................... 167 82—Helvetia silt loam, 2 to 7 percent slopes....................................................... 168 83—Hemcross-Klistan complex, 5 to 30 percent slopes...................................... 169 84—Hemcross-Klistan complex, 30 to 60 percent slopes.................................... 171 85—Holcomb silt loam, 0 to 3 percent slopes...................................................... 174 86—Honeygrove-Peavine complex, 3 to 30 percent slopes................................. 175 87—Honeygrove-Peavine complex, 30 to 60 percent slopes............................... 177 88—Honeygrove-Peavine complex, basalts, 3 to 30 percent slopes.................... 179 89—Honeygrove-Peavine complex, basalts, 30 to 60 percent slopes.................. 181 90—Honeygrove-Shivigny complex, 3 to 30 percent slopes................................ 183 91—Jory silty clay loam, basalt bedrock, 2 to 12 percent slopes......................... 185 92—Jory silty clay loam, basalt bedrock, 12 to 20 percent slopes....................... 186 93—Jory silty clay loam, basalt bedrock, 20 to 30 percent slopes....................... 188 94—Jory silty clay loam, sedimentary bedrock, 2 to 12 percent slopes............... 189 95—Jory silty clay loam, sedimentary bedrock, 12 to 20 percent slopes............. 190 96—Jory silty clay loam, sedimentary bedrock, 20 to 30 percent slopes............. 192 97—Jory-Dupee complex, 2 to 12 percent slopes............................................... 193 98—Jory-Gelderman complex, 12 to 30 percent slopes...................................... 195 99—Jory-Nekia complex, 12 to 20 percent slopes............................................... 197 100—Jory-Nekia complex, 20 to 30 percent slopes............................................. 199 101—Kirkendall-Nekoma-Quosatana complex, 0 to 3 percent slopes................. 201 102—Klistan-Harslow complex, 30 to 60 percent slopes..................................... 203 103—Klistan-Harslow-Hemcross complex, 5 to 30 percent slopes...................... 205 104—Laderly-Murtip-Giveout complex, 5 to 30 percent slopes ........................... 208 viii Soil Survey of 105—Linslaw loam, 0 to 3 percent slopes ........................................................... 210 106—Linslaw loam, 3 to 8 percent slopes ........................................................... 211 107—Lurnick-Luckiamute complex, 60 to 90 percent slopes............................... 212 108—Lurnick-Luckiamute-Maryspeak complex, 30 to 60 percent slopes............ 214 109—MacDunn-Price-Ritner complex, 60 to 90 percent slopes.......................... 217 110—Malabon silty clay loam, 0 to 3 percent slopes........................................... 220 111—Malabon silty clay loam, rarely flooded, 0 to 3 percent slopes ................... 221 112—Maryspeak gravelly medial sandy loam, 5 to 30 percent slopes ................ 222 113—McAlpin silty clay loam, 0 to 3 percent slopes............................................ 224 114—McAlpin silty clay loam, 3 to 6 percent slopes............................................ 225 115—McAlpin silty clay loam, high precipitation, 0 to 3 percent slopes............... 226 116—McAlpin silty clay loam, high precipitation, 3 to 6 percent slopes............... 228 117—McAlpin silty clay loam, rarely flooded, 0 to 3 percent slopes .................... 229 118—McBee silty clay loam, 0 to 3 percent slopes.............................................. 230 119—McBee silty clay loam, nonflooded, 0 to 3 percent slopes.......................... 231 120—Meda-Treharne-Wasson complex, 0 to 20 percent slopes ......................... 232 121—Mulkey medial loam, 3 to 30 percent slopes............................................... 235 122—Mulkey medial loam, 30 to 60 percent slopes............................................. 237 123—Murtip-Giveout-Laderly complex, 5 to 30 percent slopes........................... 238 124—Nekoma-Fluvaquents complex, 0 to 3 percent slopes................................ 241 125—Newberg fine sandy loam, 0 to 3 percent slopes........................................ 243 126—Newberg fine sandy loam, high precipitation, 0 to 3 percent slopes........... 244 127—Newberg loam, 0 to 3 percent slopes......................................................... 245 128—Oldblue-Burntwoods complex, 5 to 30 percent slopes ............................... 246 129—Panther silty clay loam, 2 to 12 percent slopes.......................................... 248 130—Pengra silt loam, 2 to 12 percent slopes..................................................... 250 131—Philomath silty clay loam, 3 to 12 percent slopes....................................... 251 132—Pilchuck fine sandy loam, 0 to 3 percent slopes......................................... 252 133—Pits ............................................................................................................. 253 134—Preacher-Blachly-Bohannon complex, 5 to 30 percent slopes................... 254 135—Preacher-Bohannon complex, 5 to 35 percent slopes................................ 256 136—Preacher-Bohannon-Slickrock complex, 35 to 60 percent slopes.............. 258 137—Price-MacDunn-Ritner complex, 30 to 60 percent slopes.......................... 261 138—Riverwash................................................................................................... 263 139—Salem gravelly silt loam, 0 to 3 percent slopes........................................... 264 140—Santiam silt loam, 2 to 8 percent slopes..................................................... 265 141—Santiam silt loam, 8 to 20 percent slopes................................................... 266 142—Sevencedars-Newanna complex, 60 to 90 percent slopes......................... 268 143—Sevencedars-Newanna-Woodspoint complex, 5 to 30 percent slopes....... 270 144—Sevencedars-Newanna-Woodspoint complex, 30 to 60 percent slopes..... 273 145—Shivigny-Honeygrove complex, 30 to 60 percent slopes............................ 275 146—Slickrock gravelly medial loam, 3 to 25 percent slopes .............................. 278 147—Steiwer-Chehulpum complex, 3 to 12 percent slopes ................................ 279 148—Steiwer-Chehulpum complex, 12 to 30 percent slopes .............................. 281 149—Steiwer-Chehulpum complex, 30 to 60 percent slopes .............................. 283 150—Treharne-Eilertsen-Zyzzug complex, 0 to 7 percent slopes ....................... 285 151—Valsetz-Yellowstone complex, 3 to 30 percent slopes ................................ 287 152—Valsetz-Yellowstone complex, 30 to 60 percent slopes .............................. 289 153—Valsetz-Yellowstone complex, 60 to 90 percent slopes .............................. 292 154—Verboort silty clay loam, 0 to 3 percent slopes........................................... 294 155—Waldo silty clay loam, 0 to 3 percent slopes............................................... 295 156—Waldo silty clay loam, high precipitation, 0 to 3 percent slopes.................. 296 157—Wapato silty clay loam, 0 to 3 percent slopes............................................. 298 158—Wapato silty clay loam, high precipitation, 0 to 3 percent slopes................ 299