Natural Resources
Conservation Service
Major Land Resource Area 002X
Major Land Resource Area
Accessed: 04/21/2026
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Next, learn more about the selected ecological site and its characteristic dynamics by browsing the ecological site description and exploring alternative state and transition model formats.
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Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
ProvisionalF002XN906WA/F002XN906WAWestern hemlock-western redcedar/red huckleberry-salal/western swordferniKey Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
-
i
Key Characteristics
- Site resides in north of the Columbia River
- Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
- Area is located in San Juan or Island Counties
- Area with soils that do not meet hydric criteria
- Forested areas
- Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
- Soils with andic subgroups
Ecological site map
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Zoom in to display soil survey map units for an area of interest, and zoom out to display MLRAs. Select a map unit polygon to view ecological sites correlated to that map unit. View a brief description of an ecological site by clicking on its name in the map popup. Soil survey correlations may not be accurate, and ecological site classification of a location should always be verified in the field. Each selection may require the transfer of several hundred KB of data.
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Ecological sites
Major Land Resource Areas
Ecological site photos
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Filter by
interactive key
precipitation
frost free days
more..
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Parent material origin
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Soil texture
Site resides in north of the Columbia River
Site resides in south of the Columbia River
Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
Mesic areas in the Portland basin and Surrounding Hills - LRU B Portland Basin and Hills
Area is located in San Juan or Island Counties
Area is not located in San Juan or Island Counties
Area with soils that meet hydric criteria
Area with soils that do not meet hydric criteria
Soil meets hydric criteria 1 or 4
Soil meets hydric criteria 2 or 3
Soil meets hydric criteria 1; Histosols
R002XN603WA – Bog or Fen
R002XN603WA – Bog or Fen
Soil meets hydric criteria 4 and is tidally influenced
R002XN713WA – Tidal Meadow
R002XN713WA – Tidal Meadow
Forested soil that meets hydric indicator 2 or 3
F002XN904WA – Sitka spruce - red alder/salmonberry/field horsetail
F002XN904WA – Sitka spruce - red alder/salmonberry/field horsetail
Non-forested soil that meets hydric indicator 2 or 3
R002XN613WA – Cool Wet Prairie
R002XN613WA – Cool Wet Prairie
Forested areas
Non-forested areas
Soils that are dry between 60 and 90 consecutive days in the soil moisture control section
Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
Between 60 and 75 days dry in the soil moisture control section
F002XN906WA – Western hemlock-western redcedar/red huckleberry-salal/western swordfern
F002XN906WA – Western hemlock-western redcedar/red huckleberry-salal/western swordfern
Between 75 and 90 days dry in the soil moisture control section
F002XN901WA – Douglas-fir - Pacific madrone/oceanspray/rattlesnake plantain
F002XN901WA – Douglas-fir - Pacific madrone/oceanspray/rattlesnake plantain
Soils with andic subgroups
F002XN902WA – Western hemlock - Douglas-fir/Cascade Oregongrape
F002XN902WA – Western hemlock - Douglas-fir/Cascade Oregongrape
Soils without andic subgroups
F002XN903WA – Western redcedar - Douglas-fir/salal/swordfern
F002XN903WA – Western redcedar - Douglas-fir/salal/swordfern
Soils that are excessively drained and isolated to steep bluffs adjacent to salt water
R002XN723WA – Salt Water Bluff
R002XN723WA – Salt Water Bluff
Other non-forested soils
Soils with a lithic contact
R002XN202WA – Prairie Bald
R002XN202WA – Prairie Bald
Soils without a lithic contact
R002XN502WA – Xeric Prairie
R002XN502WA – Xeric Prairie
Area is in a tidal zone
AX002X01X002 – Puget Lowlands Tidal Flat
AX002X01X002 – Puget Lowlands Tidal Flat
Area is not in a tidal zone
Area with soils that meet hydric criteria 1, 2 or 3
Area with soils that do not meet hydric criteria 1, 2, or 3
Soil meets hydric criteria 2 or 3
AX002X01X007 – Puget Lowlands Wet Hemlock Forest
AX002X01X007 – Puget Lowlands Wet Hemlock Forest
Soil meets hydric criteria 1; Histosols
AX002X01X003 – Puget Lowlands Peat Wetlands
AX002X01X003 – Puget Lowlands Peat Wetlands
Site located in a floodplain or riparian area and has flooding frequency of occasional or frequent
AX002X01X008 – Puget Lowlands Riparian Forest
AX002X01X008 – Puget Lowlands Riparian Forest
Other soils not located in a floodplain or riparian area or has a flooding frequency of none, very rare, or rare
Xeric sites with soils that are dry between 45 and 75 consecutive days in the soil moisture control section
Xeric sites with soils that are dry between 75 and 90 consecutive days in the soil moisture control section
Udic sites or frigid sites - Refer to MLRA 1 or MLRA 3
Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
AX002X01X005 – Puget Lowlands Moist Forest
AX002X01X005 – Puget Lowlands Moist Forest
Soils that are dry between 60 and 75 consecutive days in the soil moisture control section
AX002X01X004 – Puget Lowlands Forest
AX002X01X004 – Puget Lowlands Forest
Forested sites
AX002X01X001 – Puget Lowlands Dry Forest
AX002X01X001 – Puget Lowlands Dry Forest
Non-forested sites
AX002X01X006 – Puget Lowlands Dry Prairie
AX002X01X006 – Puget Lowlands Dry Prairie
Area with soils that meet hydric criteria 1, 2 or 3
Area with soils that do not meet hydric criteria 1, 2, or 3
Soil meets hydric criteria 1; Histosols
AX002X02X003 – Portland Basin Bogs and Fens
AX002X02X003 – Portland Basin Bogs and Fens
Soil meets hydric criteria 2 or 3
AX002X02X007 – Portland Basin Wet Forest
AX002X02X007 – Portland Basin Wet Forest
Site located in a floodplain or riparian area and has flooding frequency of occasional or frequent
AX002X02X008 – Portland Basin Riparian Forest
AX002X02X008 – Portland Basin Riparian Forest
Site not located in a floodplain or riparian area or has a flooding frequency of none, very rare, or rare
Xeric sites with soils that are dry between 45 and 75 consecutive days in the soil moisture control section
AX002X02X004 – Portland Basin Forest
AX002X02X004 – Portland Basin Forest
. Xeric sites with soils that are dry between 75 and 90 consecutive days in the soil moisture control section
AX002X02X001 – Portland Basin Dry Douglas-fir Forest
AX002X02X001 – Portland Basin Dry Douglas-fir Forest
Udic sites or frigid sites - Refer to MLRA 1 or MLRA 3
Floodplains; soil composed of alluvium
Valley-floor landforms; elevation <400’; soil composed entirely of Missoula Flood deposits
Hills and valley-border landforms; elevation is 150’ to 1500’; soils below 400’ may contain silty Missoula Flood deposits in the upper part
Mesic areas in the Portland Basin and Surrounding Hills - LRU B Portland Basin and Hills
Mesic areas in the Willamette Valley - LRU C Willamette Valley
Summer-flooding; located along the Columbia River go to LRU B (Portland Basin and Hills) Key
Winter-flooding; located along the Willamette River or its tributaries go to LRU C (Willamette Valley) Key
Soil is gravelly or sandy go to LRU B Key
Soil is silty, clayey, or loamy go to LRU C Key
Located north of Newberg-Canby-Molalla (towns); cooler summer temperatures; soils may contain loess and fragipans go to LRU B Key
Located south of Newberg-Canby-Molalla; warmer summer temperatures; loess and fragipans absent go to LRU C Key
Floodplains usually of the Columbia River; associated river is tidally-influenced but not brackish; annual flooding peaked in June or July prior to flood control
Terraces; soil formed entirely in Missoula Flood deposits
Hills and valley-border landforms
Soil poorly drained
R002XB001OR – Backswamp Group
R002XB001OR – Backswamp Group
Soil well to excessively well drained
F002XB002OR – Levee Group
F002XB002OR – Levee Group
Soil formed in sandy or gravelly glaciofluvial deposits
F002XB003OR – Gravelly Terrace Group
F002XB003OR – Gravelly Terrace Group
Soil formed in loamy, silty, or clayey glaciolacustrine deposits go to 3c (main valley floor) in Oregon LRU C Key
Soil rejuvenated by loess; superactive cation-exchange activity class; Inceptisols or Alfisols with fragic soil properties
Loess influence is absent or subtle; soil formed in colluvium and residuum; active cation-exchange activity class; Ultisols and Alfisols
F002XB006OR – Foothill Group
F002XB006OR – Foothill Group
Seasonal water table usually perched above an aquitard occurs within 20 inches of the soil surface
F002XB004OR – Fragipan Hill Group
F002XB004OR – Fragipan Hill Group
Seasonal water table absent or located below 20 inches
F002XB005OR – Loess Hill Group
F002XB005OR – Loess Hill Group
Active floodplains; floods occur during winter; sandy or gravelly material in or below soil profile
Relict floodplains or low stream terraces; if flooding occurs, it is low-energy
Main valley-floor; soils formed entirely in silty, clayey, or loamy Missoula Flood deposits
Hills and valley-border landforms
High-energy flooding with fluvial scour and sand/gravel deposition; upper part of soil is coarse-loamy or coarser; well to excessively drained
F002XC001OR – Riparian Group
F002XC001OR – Riparian Group
Overbank deposition a dominant process; upper part of soil is fine-loamy or finer
Soil poorly or somewhat poorly drained
F002XC002OR – Backswamp Group
F002XC002OR – Backswamp Group
Soil well or moderately well drained
F002XC003OR – Low Flood Plain Group
F002XC003OR – Low Flood Plain Group
Soil very poorly drained with layers of organic soil material
R002XC004OR – Marsh Group
R002XC004OR – Marsh Group
Soil poorly or somewhat poorly drained
R002XC005OR – High Flood Plain Group
R002XC005OR – High Flood Plain Group
Soil well or moderately well drained
R002XC006OR – Stream Terrace Group
R002XC006OR – Stream Terrace Group
Soil poorly drained or somewhat poorly drained; seasonal water table; droughty in summer
R002XC007OR – Valley Swale Group
R002XC007OR – Valley Swale Group
Soil well or moderately well drained
R002XC008OR – Valley Terrace Group
R002XC008OR – Valley Terrace Group
Soil < 50cm to bedrock; located on warm exposures
R002XC009OR – Bald Group
R002XC009OR – Bald Group
Soil >50cm to bedrock
Footslopes, terraces, and alluvial fans; soil usually contains a discontinuity between contrasting parent materials
Hillslopes, mountain slopes, or landslides; soil parent material is residuum or colluvium
Soil poorly or somewhat poorly drained; often with a seasonally perched water table; droughty in summer
R002XC010OR – Claypan Low Hill Group
R002XC010OR – Claypan Low Hill Group
Soil well or moderately well drained
R002XC011OR – Low Hill Group
R002XC011OR – Low Hill Group
Old, red soils on stable landscape positions; Ultisols
R002XC012OR – Red Hill Group
R002XC012OR – Red Hill Group
. Younger, brown soils subject to active transport processes; Inceptisols or Alfisols
F002XC013OR – Foothill Group
F002XC013OR – Foothill Group
Long term average mean annual precipitation
- No filter
- 60 – 80cm (24 – 31in)
- 80 – 100cm (31 – 39in)
- 100 – 120cm (39 – 47in)
- 120 – 140cm (47 – 55in)
- 140 – 500cm (55 – 197in)
—
cm
Long term average frost free days
- No filter
- 190 – 210days
- 210 – 230days
- 230 – 250days
—
days
- No filter
- 0 – 200m (0 – 700ft)
- 200 – 400m (700 – 1300ft)
- 400 – 600m (1300 – 2000ft)
- 600 – 800m (2000 – 2600ft)
—
m
- No filter
- 0 – 3%
- 3 – 5%
- 5 – 10%
- 10 – 15%
- 15 – 20%
- 20 – 25%
- 25 – 30%
- 30 – 35%
- 35 – 40%
- 40 – 45%
- 45 – 50%
- 50 – 60%
- 60 – 70%
- 70 – 80%
- 80 – 90%
- 90 – 100%
—
%
- No filter
- Alluvial fan
- Beach terrace
- Bluff
- Depression
- Drainageway
- Estuary
- Flood plain
- Fluvial terrace
- Hill
- Hillside or mountainside
- Hillslope
- Mountain
- Mountain slope
- Outwash plain
- Oxbow
- Sea cliff
- Shoreline
- Stream terrace
- Swale
- Terrace
- Terrace--outwash or marine
- Tidal flat
- Till plain
- Valley
- Valley flat
- No filter
- Igneous and sedimentary
- Metasedimentary, unspecified
- No filter
- Alluvium
- Colluvium
- Drift
- Glaciofluvial deposits
- Glaciolacustrine deposits
- Loess
- Residuum
Soil surface texture
- No filter
- Coarse sandy loam
- Fine sandy loam
- Loam
- Loamy sand
- Sand
- Silt loam
- Sandy loam
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Ecological site keys
MLRA 2
I.
Site resides in north of the Columbia River
A.
Mesic areas in or near the Puget Sound that were modified by Pleistocene continental or alpine glaciation - LRU A Puget Lowlands
1
Area is located in San Juan or Island Counties
i.
Area with soils that meet hydric criteria
a.
Soil meets hydric criteria 1 or 4
b.
Soil meets hydric criteria 2 or 3
1)
Forested soil that meets hydric indicator 2 or 3
... F002XN904WA – Sitka spruce - red alder/salmonberry/field horsetail
ii.
Area with soils that do not meet hydric criteria
a.
Forested areas
1)
Soils that are dry between 60 and 90 consecutive days in the soil moisture control section
a)
Between 60 and 75 days dry in the soil moisture control section
... F002XN906WA – Western hemlock-western redcedar/red huckleberry-salal/western swordfern
b)
Between 75 and 90 days dry in the soil moisture control section
... F002XN901WA – Douglas-fir - Pacific madrone/oceanspray/rattlesnake plantain
2)
Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
b.
Non-forested areas
1)
Soils that are excessively drained and isolated to steep bluffs adjacent to salt water
... R002XN723WA – Salt Water Bluff
2)
Other non-forested soils
2
Area is not located in San Juan or Island Counties
ii.
Area is not in a tidal zone
a.
Area with soils that meet hydric criteria 1, 2 or 3
b.
Area with soils that do not meet hydric criteria 1, 2, or 3
1)
Site located in a floodplain or riparian area and has flooding frequency of occasional or frequent
... AX002X01X008 – Puget Lowlands Riparian Forest
2)
Other soils not located in a floodplain or riparian area or has a flooding frequency of none, very rare, or rare
a)
Xeric sites with soils that are dry between 45 and 75 consecutive days in the soil moisture control section
(1)
Soils that are dry between 45 and 60 consecutive days in the soil moisture control section
... AX002X01X005 – Puget Lowlands Moist Forest
(2)
Soils that are dry between 60 and 75 consecutive days in the soil moisture control section
... AX002X01X004 – Puget Lowlands Forest
b)
Xeric sites with soils that are dry between 75 and 90 consecutive days in the soil moisture control section
c)
Udic sites or frigid sites - Refer to MLRA 1 or MLRA 3
B.
Mesic areas in the Portland basin and Surrounding Hills - LRU B Portland Basin and Hills
1
Area with soils that meet hydric criteria 1, 2 or 3
2
Area with soils that do not meet hydric criteria 1, 2, or 3
i.
Site located in a floodplain or riparian area and has flooding frequency of occasional or frequent
... AX002X02X008 – Portland Basin Riparian Forest
ii.
Site not located in a floodplain or riparian area or has a flooding frequency of none, very rare, or rare
a.
Xeric sites with soils that are dry between 45 and 75 consecutive days in the soil moisture control section
... AX002X02X004 – Portland Basin Forest
b.
. Xeric sites with soils that are dry between 75 and 90 consecutive days in the soil moisture control section
... AX002X02X001 – Portland Basin Dry Douglas-fir Forest
c.
Udic sites or frigid sites - Refer to MLRA 1 or MLRA 3
II.
Site resides in south of the Columbia River
A.
Floodplains; soil composed of alluvium
1
Summer-flooding; located along the Columbia River go to LRU B (Portland Basin and Hills) Key
2
Winter-flooding; located along the Willamette River or its tributaries go to LRU C (Willamette Valley) Key
B.
Valley-floor landforms; elevation <400’; soil composed entirely of Missoula Flood deposits
1
Soil is gravelly or sandy go to LRU B Key
2
Soil is silty, clayey, or loamy go to LRU C Key
C.
Hills and valley-border landforms; elevation is 150’ to 1500’; soils below 400’ may contain silty Missoula Flood deposits in the upper part
1
Located north of Newberg-Canby-Molalla (towns); cooler summer temperatures; soils may contain loess and fragipans go to LRU B Key
2
Located south of Newberg-Canby-Molalla; warmer summer temperatures; loess and fragipans absent go to LRU C Key
D.
Mesic areas in the Portland Basin and Surrounding Hills - LRU B Portland Basin and Hills
1
Floodplains usually of the Columbia River; associated river is tidally-influenced but not brackish; annual flooding peaked in June or July prior to flood control
2
Terraces; soil formed entirely in Missoula Flood deposits
ii.
Soil formed in loamy, silty, or clayey glaciolacustrine deposits go to 3c (main valley floor) in Oregon LRU C Key
3
Hills and valley-border landforms
i.
Soil rejuvenated by loess; superactive cation-exchange activity class; Inceptisols or Alfisols with fragic soil properties
a.
Seasonal water table usually perched above an aquitard occurs within 20 inches of the soil surface
... F002XB004OR – Fragipan Hill Group
ii.
Loess influence is absent or subtle; soil formed in colluvium and residuum; active cation-exchange activity class; Ultisols and Alfisols
... F002XB006OR – Foothill Group
E.
Mesic areas in the Willamette Valley - LRU C Willamette Valley
1
Active floodplains; floods occur during winter; sandy or gravelly material in or below soil profile
i.
High-energy flooding with fluvial scour and sand/gravel deposition; upper part of soil is coarse-loamy or coarser; well to excessively drained
... F002XC001OR – Riparian Group
ii.
Overbank deposition a dominant process; upper part of soil is fine-loamy or finer
2
Relict floodplains or low stream terraces; if flooding occurs, it is low-energy
3
Main valley-floor; soils formed entirely in silty, clayey, or loamy Missoula Flood deposits
i.
Soil poorly drained or somewhat poorly drained; seasonal water table; droughty in summer
... R002XC007OR – Valley Swale Group
4
Hills and valley-border landforms
ii.
Soil >50cm to bedrock
a.
Footslopes, terraces, and alluvial fans; soil usually contains a discontinuity between contrasting parent materials
1)
Soil poorly or somewhat poorly drained; often with a seasonally perched water table; droughty in summer
... R002XC010OR – Claypan Low Hill Group
b.
Hillslopes, mountain slopes, or landslides; soil parent material is residuum or colluvium
2)
. Younger, brown soils subject to active transport processes; Inceptisols or Alfisols
... F002XC013OR – Foothill Group
The Ecosystem Dynamics Interpretive Tool is an information system framework developed by the USDA-ARS Jornada Experimental Range, USDA Natural Resources Conservation Service, and New Mexico State University.
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