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Major Land Resource Area 019X

Major Land Resource Area

Accessed: 05/04/2026

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Description

MLRA 19 is considered the Citrus Belt of California. This area, which is entirely in California, is characterized by both the gently sloping to strongly sloping, dissected coastal and alluvial plains as well as the steep, erosive hills and mountains of the Transverse and Peninsular Ranges in Southern California (which were formerly MLRA 20, Southern California Mountains). It consists primarily of annual and perennial grasslands, coastal scrub and chaparral shrublands, and coast live oak savannahs and woodlands. The numerous narrow valleys interspersed throughout have similar characteristics. MLRA 19 has a gradual boundary with MLRA 15 to the north. MLRA 15 is characterized by the geologically complex, gently sloping to steep, low-elevation Coast Ranges that primarily support oak woodlands, oak savannahs, chaparral, and grasslands. To the east, MLRA 19 has a rapid transition to MLRA 30 as soil temperature increases and precipitation decreases, which result in the dominance of creosote bush and white bursage.

Key publications

Land Resource Regions and Major Land Resource Areas of the United States, the Caribbean, and the Pacific Basin

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Ecological site group list

Provisional

F019XG913CA

Loamy Hills <30"ppt
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

F019XG914CA

Loamy Hills >30"ppt
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

F019XG915CA

Sandy Hills <30"ppt
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

F019XG916CA

Sandy Hills >30"ppt
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG901CA

Tidal Flat
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG902CA

Beaches
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG903CA

Salt Marsh
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG904CA

Dunes
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG905CA

Riparian
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG906CA

Clayey Bottom
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG907CA

Loamy Bottom
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG908CA

Sandy Bottom
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG909CA

Terrace
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG910CA

Clayey Fan
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG911CA

Loamy Fan
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Provisional

R019XG912CA

Sandy Fan
i
Key Characteristics
1. Site located north of the Columbia River.
2. Within a national park soil survey or in an area joining with a national park in the Washington Cascades Range
3. MOUNT RAINIER NATIONAL PARK
4. Site is forested, and more than 25 percent is covered with trees
5. Site is composed primarily of coniferous tree species. If yes, go to “m.” m. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory.
6. Site commonly is at an elevation of 1,600 to 4,600 feet above sea level, in the southern Washington Cascades. Western hemlock typically in the overstory
7. Site is on debris aprons, mountain slopes, valley walls, and ridges. Common overstory species are western hemlock, Douglas-fir, and western redcedar. Common understory species include Cascade Oregon grape, salal, vine maple, red huckleberry, baldhip rose, western rattlesnake plantain, and twinflower. If yes, the site is Southern Washington Cascades Frigid Coniferous Forest (F003XN943WA).
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Ecological site groups

Major Land Resource Areas

Ecological site group photos

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Ecological site group keys

MLRA 19

I. located on tidal flats ... R019XG901CA – Tidal Flat

II. located on beaches ... R019XG902CA – Beaches

III. located in salt marshes ... R019XG903CA – Salt Marsh

IV. located on sand dunes ... R019XG904CA – Dunes

V. located in riparian areas ... R019XG905CA – Riparian

VI. located on basin floors

A. clayey texture ... R019XG906CA – Clayey Bottom

B. loamy texture ... R019XG907CA – Loamy Bottom

C. sandy texture ... R019XG908CA – Sandy Bottom

VII. located on terraces ... R019XG909CA – Terrace

VIII. located on alluvial fans

A. clayey texture ... R019XG910CA – Clayey Fan

B. loamy texture ... R019XG911CA – Loamy Fan

C. sandy texture ... R019XG912CA – Sandy Fan

IX. located on hills

A. loamy texture

1 <30" ppt ... F019XG913CA – Loamy Hills <30"ppt

2 >30" ppt ... F019XG914CA – Loamy Hills >30"ppt

B. sandy texture

1 <30" ppt ... F019XG915CA – Sandy Hills <30"ppt

2 >30" ppt ... F019XG916CA – Sandy Hills >30"ppt

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