Natural Resources
Conservation Service
Major Land Resource Area 016X
Major Land Resource Area
Accessed: 04/22/2026
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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 located north of the Columbia River.
- Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
- MOUNT RAINIER NATIONAL PARK
- Site is forested, and more than 25 percent is covered with trees
- Site commonly is on gently sloping or flat flood plains and terraces associated with streams and rivers in the southern Washington Cascades
- Site is at an elevation of 1,600 to 2,100 feet above sea level. Common trees are black cottonwood, western hemlock, western redcedar, and red alder. Common understory plants include Cascade Oregon grape, western rattlesnake plantain, ladyfern, western brackenfern, and queencup beadlily. If yes, the site is Southern Washington Cascades Frigid Riparian Forest (F003XN940WA).
-
i
Key Characteristics
- Site located north of the Columbia River.
- Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
- MOUNT RAINIER NATIONAL PARK
- Site is forested, and more than 25 percent is covered with trees
- Site commonly is on gently sloping or flat flood plains and terraces associated with streams and rivers in the southern Washington Cascades
- Site is at an elevation of 1,600 to 2,100 feet above sea level. Common trees are black cottonwood, western hemlock, western redcedar, and red alder. Common understory plants include Cascade Oregon grape, western rattlesnake plantain, ladyfern, western brackenfern, and queencup beadlily. If yes, the site is Southern Washington Cascades Frigid Riparian Forest (F003XN940WA).
-
i
Key Characteristics
- Site located north of the Columbia River.
- Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
- MOUNT RAINIER NATIONAL PARK
- Site is forested, and more than 25 percent is covered with trees
- Site commonly is on gently sloping or flat flood plains and terraces associated with streams and rivers in the southern Washington Cascades
- Site is at an elevation of 1,600 to 2,100 feet above sea level. Common trees are black cottonwood, western hemlock, western redcedar, and red alder. Common understory plants include Cascade Oregon grape, western rattlesnake plantain, ladyfern, western brackenfern, and queencup beadlily. If yes, the site is Southern Washington Cascades Frigid Riparian Forest (F003XN940WA).
-
i
Key Characteristics
- Site located north of the Columbia River.
- Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
- MOUNT RAINIER NATIONAL PARK
- Site is forested, and more than 25 percent is covered with trees
- Site commonly is on gently sloping or flat flood plains and terraces associated with streams and rivers in the southern Washington Cascades
- Site is at an elevation of 1,600 to 2,100 feet above sea level. Common trees are black cottonwood, western hemlock, western redcedar, and red alder. Common understory plants include Cascade Oregon grape, western rattlesnake plantain, ladyfern, western brackenfern, and queencup beadlily. If yes, the site is Southern Washington Cascades Frigid Riparian Forest (F003XN940WA).
-
i
Key Characteristics
- Site located north of the Columbia River.
- Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
- MOUNT RAINIER NATIONAL PARK
- Site is forested, and more than 25 percent is covered with trees
- Site commonly is on gently sloping or flat flood plains and terraces associated with streams and rivers in the southern Washington Cascades
- Site is at an elevation of 1,600 to 2,100 feet above sea level. Common trees are black cottonwood, western hemlock, western redcedar, and red alder. Common understory plants include Cascade Oregon grape, western rattlesnake plantain, ladyfern, western brackenfern, and queencup beadlily. If yes, the site is Southern Washington Cascades Frigid Riparian Forest (F003XN940WA).
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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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Precipitation
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Soil texture
Location is situated east of Winter Island, CA - LRU 16XA
Location is situated on Winter Island or further west - LRU 16XB
Site is located on organic soils
R016XA001CA – Tidally-Influenced, Freshwater
R016XA001CA – Tidally-Influenced, Freshwater
Site is located on mineral soils
Site is located in sand dune topography
R016XA004CA – Island Sandhills
R016XA004CA – Island Sandhills
Site not as above
Site occurs on natural levees
R016XA002CA – Freshwater, Stratified, Fluventic
R016XA002CA – Freshwater, Stratified, Fluventic
Site not as above
Site historically hydrologically complex and historically tide water inundated
R016XA001CA – Tidally-Influenced, Freshwater
R016XA001CA – Tidally-Influenced, Freshwater
Soils not as above - Ecological site not tied to MLRA 16
Site is located on organic soils
R016XB001CA – Tidally-Influenced, Salt-Affected
R016XB001CA – Tidally-Influenced, Salt-Affected
Site is located on mineral soils
Site historically subject to infrequent inundation from storm runoff events
R016XB002CA – Salt-Affected, Stratified, Fluventic
R016XB002CA – Salt-Affected, Stratified, Fluventic
Site historically subjected to frequent tidal inundation (mineral fringe soils)
R016XB001CA – Tidally-Influenced, Salt-Affected
R016XB001CA – Tidally-Influenced, Salt-Affected
Long term average mean annual precipitation
- No filter
- 30 – 35cm (12 – 14in)
- 35 – 40cm (14 – 16in)
- 40 – 50cm (16 – 20in)
- 50 – 60cm (20 – 24in)
- 60 – 80cm (24 – 31in)
—
cm
Long term average frost free days
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- 270 – 290days
—
days
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- 0 – 200m (0 – 700ft)
—
m
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- 0 – 3%
- 3 – 5%
- 5 – 10%
- 10 – 15%
- 15 – 20%
—
%
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- Delta
- Dune
- Estuary
- Flood plain
- Marsh
- Natural levee
- Stream terrace
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- Granite
- Mudstone
- Sandstone and shale
- Sandstone, unspecified
- Shale and siltstone
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- Alluvium
- Eolian deposits
Soil surface texture
- No filter
- Clay loam
- Fine sandy loam
- Loam
- Sand
- Sandy clay loam
- Silty clay loam
- Silt loam
- Sandy loam
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Ecological site keys
MLRA 16
1
Location is situated east of Winter Island, CA - LRU 16XA
A'
Site is located on mineral soils
B'
Site not as above
C'
Site not as above
D
Site historically hydrologically complex and historically tide water inundated
... R016XA001CA – Tidally-Influenced, Freshwater
D'
Soils not as above - Ecological site not tied to MLRA 16
1'
Location is situated on Winter Island or further west - LRU 16XB
A'
Site is located on mineral soils
B
Site historically subject to infrequent inundation from storm runoff events
... R016XB002CA – Salt-Affected, Stratified, Fluventic
B'
Site historically subjected to frequent tidal inundation (mineral fringe soils)
... R016XB001CA – Tidally-Influenced, Salt-Affected
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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