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San Lorenzo River
The San Lorenzo River drains a large watershed in Santa Cruz County, California. The headwaters originate in the Santa Cruz Mountains (in Castle Rock State Park) at an elevation of , and the river flows 〔U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. (The National Map ), accessed March 15, 2011〕 through the San Lorenzo Valley before emptying into the Pacific Ocean at Monterey Bay. The San Lorenzo River was once one of the most popular steelhead and coho salmon rivers on the Central Coast of California. In 1960, it was estimated that there were more than 30,000 fish living in this river, but a decade later the population had been reduced to 1000. The Branciforte Creek watershed is a major sub-basin of the San Lorenzo catchment-basin. Fishing regulations were changed in 1998 in order to protect wild stocks vs. hatchery stocks. The changes in the regulations have not proved effective and additional conservation/preservation efforts are still needed. As of 2013, continued growth has raised demand for water from the entire watershed system bringing attention to the need for further preservation of stream flows in order to protect young salmon, steelhead and lamprey eel.
==Geology==
Underlying rock strata in the San Lorenzo River basin include Lompico Sandstone and Vaqueros Sandstone.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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