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That is raising concerns among some community members that in building pricey new houses, developers will usher in a wave of gentrification that will at least partially wipe away the architectural, racial and economic diversity that’s a hallmark of the small town below the San Gabriel Mountains.

The Arroyo Seco, “dry stream” in Spanish, comes down from the San Gabriel Mountains in Angeles National Forest and runs along the two-lane freeway in Pasadena.

The basins, essential to flood control in the San Gabriel Mountains, are largely located above residential burns areas, according to the county.

At the same time, Tujunga locals — who relish their relative isolation living against the rugged backdrop of the San Gabriel Mountains — say they are tormented by the noise, vibrations and dust caused by the hauling trucks, which traverse along homes in this semirural area.

While most of their full-moon rides in the San Gabriel Mountains are private, the group opens one or two of them to the public each year.