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Hemmed in by towering concrete floodwalls, the urban river courses nearly 49 miles through Los Angeles County, from its headwaters in the Simi Hills and Santa Susana Mountains to its mouth in Long Beach.
 The river was left in a relatively natural state until 1938, when a disastrous flood breached its banks, killing 115 people and destroying 5,000 homes. Pressure quickly built on both the city and the federal government to take drastic action to contain the river.
Although this radical transformation protected human life and property, it also diminished a diverse riparian ecosystem
 that hosted spawning grounds for various aquatic species, including the southern California steelhead trout, which is now federally endangered. These days, the much-reduced river supports only the hardiest of species, most of them non-native, such as sunfish and carp. ....

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