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San Joaquin Basin

Ecoregion in Central Valley, CA

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The San Joaquin Basin ecoregion, including the downstream Caswell Basin, is on nearly level floodplains and basin floors in the middle of the San Joaquin Valley. It is upstream of the Delta ecoregion (7j) and between alluvial fans from the Coast Ranges on the west and alluvial fans from the Sierra Nevada on the east. Elevations range from near sea level in the north to 130 feet in the south. The predominant soils are poorly drained, and much of the region is flooded periodically. The soil temperature regime is thermic and soil moisture regimes are aquic and xeric. Although cropland and hay/pasture land cover most of the region, large areas, particularly in the central part, are herbaceous wetlands. Alfalfa and corn are typical crops in the north, whereas cotton, alfalfa, corn, and tomatoes are grown in the south. Common vegetation includes emergent aquatics, cottonwood, willow, valley oak, saltgrass, alkali sacaton, creeping wildrye, and allscale.

— EPA

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