In southern California, these fish are subjected to huge variances year to year of flows, sediment loads, water temps, wildfire effects, pollution, and other negative environmental factors. Southern steelhead can tolerate warmer water temperatures than their northern counterparts, up to about 25˚C (77˚F), before they seek refuge in pools with cool seeps. Thankfully, they are also one of the most adaptive and resilient fish. Today, the southern steelhead range spans over 30,000 square km (about 11,580 square miles), has over 41,500 km (25,785 miles) of mostly intermittent streams. Rainbow trout historically populated all coastal streams of southern California with permanent flows, as either resident or anadromous forms, or both. Now, there are reportedly under a few hundred adults returning annually. In the early 1900s, hundreds of thousands of them returned to the rivers between San Louis Obispo and Mexico. Southern California steelhead are statistically the most endangered native fish in America. Southern Steelhead are Adaptive and Resilient Integrate Wild Fish and Working Landscapes.
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