Lost Lake
Springs will often form along faultlines because of the inconformity the fault produces allowing the groundwater to percolate to the surface. When a spring on the fault comes up in a low spot, it will pool and form a "sag pond." Lost Lake is such a sag pond forming as a result of the San Andreas fault.
Also see:
Springs & Oases
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A spring is the result of an aquifer being filled to the point that the
water overflows onto the land surface. There are different kinds ...
San Gabriel Mountains
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This subsection comprises the lower and warmer parts of the San Gabriel Mountains, which are ...