I need help finding the trails of the 57 freeway, heading south into OC. im not talking about carbon caynon/chino hills either. I was asking a fellow mtb guy and he told me about some descent trails of brea caynon, with actual signs (with guys on mtb) indicating where the trails start. I believe they are near the huge craters in teh ground of the freeway. anyone know where these are? its incredibly green out there right now, prime time to ride, as long as it doesnt rain...

thanks!