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Los Angeles Plain

Ecoregion in CA

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The Los Angeles Plain ecoregion is on nearly level floodplains and terraces and very gently to gently sloping alluvial fans that include the San Fernando and San Gabriel valleys. Marine air influence is great on the Los Angeles Plain and moderate in the San Fernando Valley. Annual precipitation ranges from 10 to 17 inches. The soil temperature regime is thermic and soil moisture regime is xeric. Typical vegetation historically included California sagebrush, California buckwheat, coast live oak, chamise chaparral, and annual grasslands, although most all of the region has been converted to urban and residential land cover. Hydrology has been greatly modified and channelized. The Los Angeles River drains the San Fernando Valley and San Gabriel Mountains.

— EPA

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Ecoregion